34results about How to "Meet the high-end needs of lightweight development" patented technology

The invention provides a high-thermal-conductivity corrosion-resistant Al-RE-Y-Zr alloy suitable for gravity casting and a preparation method thereof. The alloy comprises, by mass percent, 5%-16% of RE, 0.1%-7% of Y, 0.5%-0.8% of Mg, 0.01%-0.5% of Zr and the balance Al and inevitable impurity elements. RE is at least one of La and Ce. After the high-thermal-conductivity corrosion-resistant Al-RE-Y-Zr alloy is subjected to gravity casting, the room temperature tensile strength reaches up to 175 MPa, the yield strength is 86 MPa or above, the ductility is 10% or above, and the heat conductivitycoefficient is 160 W / (m.K) or above; and the high-end requirements of aerospace, war industry, cars and other industries for light weight development are met

The invention provides a high-toughness heat-resistant Mg-Gd alloy suitable for gravity casting and a preparation method thereof. The alloy comprises the following chemical components of, in percentage, 4.0-10.0% of Gd, 2.0-6.0% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M, and the balance Mg, wherein the M is one or two elements of Ti and B; the preparation method comprises the following steps that (1) burdening is performed according to a Mg-Gd alloy component; (2) an industrial pure magnesium ingot is melted; (3) heating is performed to 700 DEG C, and industrial pure zinc, an Mg-Gd and Mg-Mn intermediate alloy are melted; (4) heating is performed to 730 DEG C, after an industrial pure aluminum ingot, Al-Ti, Al-Ti-B and Al-B intermediate alloys added are all melted, refining isperformed to obtain a magnesium alloy melt; (5) gravity casting is performed; and (6) secondary solid solution and artificial aging treatment are performed. According to the high-toughness heat-resistant Mg-Gd alloy and the preparation method, after the alloy is subjected to the gravity casting, the secondary solid solution treatment and the artificial aging heat treatment, the tensile strength at room temperature is 300 MPa, the elongation percentage is 15%, the high-temperature tensile strength at 200 DEG C is 218 MPa, the elongation percentage is 20%, and the high-end requirement for lightweight development in the industries of aerospace, automobiles, telecommunication and the like is met.

The invention provides a high-strength-and-ductility heat resistance pressure casting Mg-Y alloy and a pressure casting preparing method thereof. The alloy comprises, by mass percent, 2.5 to 5.0% of Y, 1.0 to 4.0% of Zn, 0.5 to 1.2% of Al, 0.1 to 0.3% of Mn, 0.01 to 0.08% of M and the balance Mg and inevitable impurities, and M is at least one element of Ti and B. Through pressure casting of the high-strength-and-ductility heat resistance pressure casting Mg-Y alloy, the room temperature tensile strength of the pressure-casting-state alloy reaches 315 MPa, the 200-DEG C high-temperature tensile strength reaches 210 MPa, the room temperature elongation reaches 12.0%, use is achieved without aging and solid-solution heat treatment, and the high-end needs of aerospace, automotive, telecommunications and other industries for lightweight development can be met.

The invention provides a high-toughness heat-resisting pressure casting Mg-Gd alloy and a preparation method thereof. The high-toughness heat-resisting pressure casting Mg-Gd alloy comprises components including, by stoichiometric ratio, 4.0%-8.0% of Gd, 1.2%-4.8% of Zn, 0.5%-1.2% of Al, 0.1%-0.3% of Mn, 0.01%-0.08% of M and the balance Mg, wherein M is one or two elements of Ti and B. The preparation method comprises the steps that firstly, materials are prepared according to Mg-Gb alloy components; secondly, industrial pure magnesium ingots are melted; thirdly, the temperature is raised to 720 DEG C, industrial pure zinc, Mg-Gd and Mg-Mn intermediate alloys are added and stirred to be completely melted; fourthly, the temperature is raised to 730 DEG C, after industrial pure aluminum ingots, Al-Ti, Al-Ti-B and Al-B intermediate alloys are sequentially added, magnesium alloy melt is obtained after refining; and fifthly, the magnesium alloy melt is cooled to a pressure casting temperature so as to be subjected to pressure casting, and a pressure casting alloy is obtained. The strength of extension of the alloy in a pressure casting state at the room temperature reaches 318 MPa, thestrength of extension of the alloy at the high temperature of 200 DEG C reaches 218 MPa, the room temperature ductility reaches 12.0%, the high-toughness heat-resisting pressure casting Mg-Gd alloy can be used without aging or solution heat treatment, and the high-end requirement of aerospace and other industries for light weight is met.

The invention provides a high-strength-toughness and heat-resistant Al-RE-Y-Zr alloy suitable for pressure casting and a preparation method thereof. The alloy comprises the following elements in percentage by mass: 3-11% of RE, 0.1-5% of Y, 0.1-0.4% of Mg, 0.01-0.5% of Zr and the balance of Al element and inevitable impurity elements, wherein RE is at least one of La and Ce. After the high-strength-toughness and heat-resistant Al-RE-Y-Zr alloy is subjected to pressure casting, the room-temperature tensile strength of the die-cast alloy is up to 275MPa, and the elongation percentage is up to 19.5%; and the high-temperature tensile strength at 250 DEG C is up to 134MPa, and the elongation percentage is up to 25%. The alloy can be used without subsequent heat treatment, and satisfies the high-end demands for lightweight development in aerospace, military industry, automobiles and other industries.

The invention provides a pressure casting Mg-Er alloy with high strength, high toughness and heat resistance and a preparation method thereof. The alloy is composed of, by mass, 4.0-8.5% of Er, 1.2-5.1% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M, and the balance Mg, wherein the M is one or two elements of Ti and B. The preparation method comprises the following steps of (1), proportioning according to the composition of the Mg-Er alloy; (2), melting industrial pure magnesium ingots; (3), heating up to 720 DEG C, adding industrial pure zinc, Mg-Er and Mg-Mn master alloys, and stirring to melt completely; (4), heating up to 730 DEG C, and totally melting the industrial pure aluminum ingots, Al-Ti, Al-Ti-B and Al-B master alloys added in sequence to obtain a magnesium alloy melt;and (5) cooling the magnesium alloy melt to pressure casting temperature to carry out pressure casting to obtain the pressure casting alloy. After the die casting of the alloy, the tensile strength ofthe pressure casting alloy reaches 302 MPa at room temperature, the tensile strength reaches 205 MPa at the high temperature of 200 DEG C, the room temperature elongation reaches 15.0%, and the alloycan be used without aging and solid solution heat treatment to meet the high-end requirement of lightweight in aerospace and other industries.

The invention provides high-strength, high-ductility and heat-resisting Mg-Gd-Er alloy applicable to low-pressure casting and a preparation method for the same. The alloy is constituted of chemical ingredients including, by mass, 3.0%-7.0% of RE, 1.2%-4.2% of Zn, 0.5%-1.2% of Al, 0.1%-0.3% of Mn, 0.01%%-0.08% of M as well as Mg, wherein M comprises one or two elements between Ti and B. The preparation method comprises the steps that (1) the ingredients of the Mg-Gd-Er alloy are prepared; (2) industrial pure magnesium ingots are melted; (3) the temperature is increased to 700 DEG C, and industrial pure Zn and intermediate alloy of Mg-Gd, Mg-Er and Mg-Mn are melted; (4) the temperature is increased to 730 DEG C, and industrial pure aluminum ingots and intermediate alloy of Al-Ti, Al-Ti-B andAl-B are melted, so a Mg alloy melt is obtained; (5) low-pressure casting is carried out; and (6) secondary solid solution processing and artificial ageing processing are carried out. The high-strength, high-ductility and heat-resisting Mg-Gd-Er alloy applicable to low-pressure casting provided by the invention has the advantages that tensile strength under a room temperature reaches 305Mpa and aductility rate is 18% after the low-pressure casting, secondary solid solution processing and artificial ageing processing; under high-temperature tension at 200 DEG C, the tensile strength reaches 214 Mpa and the ductility rate is 22%; and the alloy satisfies high-end demands for light-weight development in industries such as aerospace and automobiles.

The invention provides a high-toughness heat-resisting pressure casting Mg-Y-Er alloy and a preparation method thereof. The high-toughness heat-resisting pressure casting Mg-Y-Er alloy comprises elements including, by mass percent, 3.0%-7.0% of RE, 1.2%-4.2% of Zn, 0.5%-1.2% of Al, 0.1%-0.3% of Mn, 0.01%-0.08% of M and the balance Mg, wherein M is one or two elements of Ti and B. The preparation method comprises the steps that firstly, materials are prepared according to Mg-Y-Er alloy components; secondly, industrial pure magnesium ingots are melted; thirdly, the temperature is raised to 720 DEG C, industrial pure zinc, Mg-Y, Mg-Er and Mg-Mn intermediate alloys are added and stirred to be completely melted; fourthly, the temperature is raised to 730 DEG C, after industrial pure aluminum ingots, Al-Ti, Al-Ti-B and Al-B intermediate alloys are sequentially added, magnesium alloy melt is obtained after refining; and fifthly, the magnesium alloy melt is cooled to a pressure casting temperature so as to be subjected to pressure casting, and a pressure casting alloy is obtained. After the alloy is subjected to pressure casting, the strength of extension of the alloy in a pressure castingstate at the room temperature reaches 312 MPa, the strength of extension of the alloy at the high temperature of 200 DEG C reaches 205 MPa, the room temperature ductility reaches 13.0%, the high-toughness heat-resisting pressure casting Mg-Y-Er alloy can be used without aging or solution heat treatment, and the high-end requirement of aerospace and other industries for light weight is met.

The invention provides a high-toughness heat-resistant Mg-Y-Er alloy suitable for low-pressure casting and a preparation method thereof. The high-toughness heat-resistant Mg-Y-Er alloy suitable for low-pressure casting is prepared from the following elements in percentage by mass: 3.0-7.0% of RE, 1.2-4.2% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M, and the balance of Mg and other inevitable impurities, wherein RE is a element composition of Y and Er, and M is at least one element of Ti and B. After being subjected to low-pressure casting, secondary solid solution treatment and manual ageing thermal treatment, the high-toughness heat-resistant Mg-Y-Er alloy suitable for low-pressure casting has room-temperature tensile strength of 304 MPa, has ductility of 19%, has high-temperature tensile strength of 209 MPa at a temperature of 200 DEG C, has ductility of 24%, and has high-end needs, on lightweight development, of industries such as aerospace, war industry and cars.

The invention provides a high-strength high-toughness heat-resistant Mg-Er alloy suitable for gravity casting and a preparation method thereof. The alloy is prepared from the following chemical components in percentage by mass: 4.0-10.0% of Er, 2.0-6.0% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M, and the balance Mg, specifically, M is one or two elements of Ti and B. The preparation method comprises the following steps: (1) carrying out burdening according to the Mg-Er alloy components; (2) melting an industrial pure magnesium ingot; (3) rising the temperature to 700 DEG C to meltindustrial pure zinc, the Mg-Er intermediate alloy and a Mg-Mn intermediate alloy; (4) rising the temperature to 730 DEG C, and adding and melting an industrial pure aluminum ingot, an Al-Ti intermediate alloy, an Al-Ti-B intermediate alloy, and an Al-B intermediate alloy to obtain a magnesium alloy melt; (5) carrying out gravity casting; and (6) carrying out secondary solid solution and artificial aging treatment. After gravity casting, secondary solid solution treatment and artificial aging heat treatment, the alloy provided by the invention has tensile strength of 296 MPa and elongation rate of 18% at room temperature; while at high temperature of 200 DEG C, the tensile strength is 215 MPa and the elongation is 23%; and the requirements of aerospace, automobile, telecommunication and other industries for light weight are met.

The invention discloses ahigh-toughness heat-resistant Mg-Y alloy suitable for gravity casting and a preparation method thereof. The alloy is prepared from the following chemical components in percentage by mass: 4.0-8.0% of Y, 3.0-6.0% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M, and the balance being Mg and other inevitable impurities, specifically, M is at least one element of Ti andB. After being subjected to gravity casting, secondary solid solution treatment and artificial aging heat treatment, the high-toughness heat-resistant Mg-Y alloy has a tensile strength of 260 MPa ormore and an elongation rate of 18% or more at room temperature, and a tensile strength of 185 MPa or more and an elongation rate of 25% or more at high temperature of 200 DEG C, thereby meeting the high-end requirements for light weight development in aerospace, military, automobile and other industries.

The invention discloses a high-strength-toughness and heat-resistance Mg-Gd alloy suitable for low-pressure casting and a preparation method thereof. The chemical composition of the alloy comprises the following in mass percentage: 4.0-8.0% of Gd, 1.2-4.8% of Zn, 0.5-1.2% of Al, 0.1-0.3% of Mn, 0.01-0.08% of M and the balance Mg and other unavoidable impurities, wherein, M is at least one elementof Ti and B. After the low-pressure casting, secondary solid-soluble treatment and artificial aging heat treatment are conducted on the high-strength-toughness and heat-resistance Mg-Gd alloy suitablefor low-pressure casting, the room temperature tensile strength is more than 280 MPa, the extension rate is more than 16%, the high-temperature stretching tensile strength at 200 DEG C is more than 190 MPa, the elongation rate is more than 16%, and the high-end demand of the lightweight development in the industries such as aerospace, military and automobiles is met.

The invention provides an Mg-Gd-Y alloy with high strength and ductility and heat resistance and suitable for low pressure casting and a preparation method thereof. The Mg-Gd-Y alloy is prepared fromthe chemical components in percentage by mass: 3.0% to 7.0% of RE, 1.2% to 4.2% of Zn, 0.5% to 1.2% of Al, 0.1% to 0.3% of Mn, 0.01% to 0.08% of M, and the balance of Mg; and M is one or two elementsin Ti and B. The prepared method includes the steps that (1) a material is prepared according to Mg-Gd-Y alloy components; (2) an industrial pure magnesium ingot is melted; (3) a temperature rises to700 DEG C, and industrial pure zinc, and Mg-Gd, Mg-Y and Mg-Mn intermediate alloys are melted; (4) the temperature rises to 730 DEG C, an industrial pure aluminium ingot, and Al-Ti, Al-Ti-B, and Al-Bintermediate alloys are added and all melted, and then magnesium alloy fondant is obtained though refining; (5) low pressure casting is conducted; and (6) second-level solution treatment and artificial aging treatment are conducted. After the Mg-Gd-Y alloy with the high strength and ductility and heat resistance and suitable for low pressure casting is subjected to low pressure casting, second-level solution treatment and artificial aging treatment, indoor temperature extension strength reaches 307 Mpa, and ductility is 17%; and high temperature tensile extension strength at 200 DEG C reaches216 Mpa, ductility is 23%, and the high-end needs of industries of aerospace, automobiles and the like for light weight development are met.

The invention provides a high-strength, toughness, heat-resistant Mg-Gd alloy suitable for gravity casting and a preparation method thereof. The alloy has a chemical composition in mass percent of: 4.0-10.0% Gd, 2.0-6.0% Zn, 0.5-1.2% Al, 0.1 ~0.3% Mn, 0.01~0.08% M, and the balance is Mg; where M is Ti, one or two elements in B. Preparation method: (1) batching according to Mg-Gd alloy composition; (2) melting industrial pure magnesium ingot; (3) heating up to 700° C., melting industrial pure zinc and Mg-Gd and Mg-Mn master alloy; ( 4) Heat up to 730°C, add industrial pure aluminum ingots, Al-Ti, Al-Ti-B, and Al-B master alloys to melt, and then refine to obtain a magnesium alloy melt; (5) Gravity casting; (6) Secondary Solution, artificial aging treatment. After gravity casting, secondary solution treatment and artificial aging heat treatment, the alloy of the present invention has a room temperature tensile strength of 300MPa and an elongation of 15%; a high temperature tensile strength of 218MPa and an elongation of 20% at 200°C, meeting the aviation Aerospace, automobile, telecommunications and other industries have high-end demands for lightweight development.

The invention provides a high-strength and toughness heat-resistant die-casting Mg-Y alloy and a preparation method thereof. The alloy includes the following elements in mass percentage: 2.5-5.0% Y, 1.0-4.0% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01-0.08% M, the balance being Mg and other unavoidable impurities; wherein M is Ti and at least one element in B. After the high-strength, toughness and heat-resistant die-casting Mg-Y alloy of the present invention is pressure-cast, the room-temperature tensile strength of the die-cast alloy reaches 315MPa, the high-temperature tensile strength at 200°C reaches 210MPa, and the room-temperature elongation reaches 12.0%, and no aging or solid solution is required. It can be used after heat treatment to meet the high-end needs of aerospace, automotive, telecommunications and other industries for lightweight development.

The invention provides a high-toughness heat-resistant Mg-Gd-Y alloy suitable for gravity casting and a preparation method thereof. The alloy comprises the following chemical components of, in percentage by mass, 4.0%-10.0% of RE, 2.0%-6.0% of Zn, 0.5%-1.2% of Al, 0.1%-0.3% of Mn, 0.01-0.08% of M and the balance Mg, wherein M is one or two elements Ti and B. The preparation method comprises the following steps of (1), proportioning according to Mg-Gd-Y alloy components; (2), melting a industrial pure magnesium ingot; (3), heating to 700 DEG C, melting industrial pure zinc, Mg-Gd-Mg-Y and Mg-Mnintermediate alloy; (4), heating to 730 DEG C, adding and melting industrial pure aluminum ingots, Al-Ti, Al-Ti-B and Al-B intermediate alloy, refining to obtain a magnesium alloy melt; (5), carryingout gravity casting; and (6) carrying out secondary solid solution and artificial aging treatment. According to the method, after the alloy is subjected to gravity casting, secondary solid solution treatment and artificial aging heat treatment, the tensile strength is 298 Mpa and the elongation percentage is 16% at room temperature; the high-temperature tensile strength is 216 Mpa and the elongation percentage is 22% at 200 DEG C, and the high-end requirement for lightweight development in the industries of aerospace, war industry, automobiles and the like is met.

The invention provides a high-strength and tough heat-resistant die-casting Mg-Gd-Er alloy and a preparation method thereof. The alloy includes the following elements in mass percentage: 3.0-8.5% RE, 1.2-4.2% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01-0.08% M, and the balance is Mg and other unavoidable impurities; wherein, RE is Gd and Er, and M is at least one element among Ti and B. After the high-strength, toughness and heat-resistant die-casting Mg-Gd-Er alloy of the present invention is die-cast, the room-temperature tensile strength of the die-cast alloy reaches 312MPa, the high-temperature tensile strength at 200°C reaches 210MPa, and the room-temperature elongation reaches 13.0%. Solution heat treatment can be used to meet the high-end demand for lightweight development in aerospace, automotive, telecommunications and other industries.

The invention provides an Mg-Gd-Y alloy with high strength and ductility and heat resistance and suitable for low pressure casting and a preparation method thereof. The Mg-Gd-Y alloy is prepared fromthe chemical components in percentage by mass: 3.0% to 7.0% of RE, 1.2% to 4.2% of Zn, 0.5% to 1.2% of Al, 0.1% to 0.3% of Mn, 0.01% to 0.08% of M, and the balance of Mg; and M is one or two elementsin Ti and B. The prepared method includes the steps that (1) a material is prepared according to Mg-Gd-Y alloy components; (2) an industrial pure magnesium ingot is melted; (3) a temperature rises to700 DEG C, and industrial pure zinc, and Mg-Gd, Mg-Y and Mg-Mn intermediate alloys are melted; (4) the temperature rises to 730 DEG C, an industrial pure aluminium ingot, and Al-Ti, Al-Ti-B, and Al-Bintermediate alloys are added and all melted, and then magnesium alloy fondant is obtained though refining; (5) low pressure casting is conducted; and (6) second-level solution treatment and artificial aging treatment are conducted. After the Mg-Gd-Y alloy with the high strength and ductility and heat resistance and suitable for low pressure casting is subjected to low pressure casting, second-level solution treatment and artificial aging treatment, indoor temperature extension strength reaches 307 Mpa, and ductility is 17%; and high temperature tensile extension strength at 200 DEG C reaches216 Mpa, ductility is 23%, and the high-end needs of industries of aerospace, automobiles and the like for light weight development are met.

The invention provides a high-strength and toughness heat-resistant die-casting Mg-Er alloy and a preparation method thereof, the alloy composition and stoichiometric ratio: 4.0-8.5% Er, 1.2-5.1% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01~0.08% M, the balance is Mg; where M is Ti, one or two elements in B. Preparation method: 1) Dosing according to the composition of Mg-Er alloy; 2) Melting industrial pure magnesium ingot; 3) Raising the temperature to 720°C, adding industrial pure zinc, Mg-Er and Mg-Mn master alloy, and stirring until completely melted ; 4) be heated up to 730 ℃, after the industrial pure aluminum ingot, Al-Ti, Al-Ti-B, Al-B master alloy added successively are all melted, obtain magnesium alloy melt after refining; (5) magnesium alloy The melt is cooled to the die-casting temperature for die-casting to obtain a die-casting alloy. After die-casting, the alloy of the present invention has a tensile strength of 302 MPa at room temperature in a die-cast state, 205 MPa at a high temperature of 200°C, and a room temperature elongation of 15.0%, and can be used without aging or solution heat treatment, meeting the needs of aerospace, etc. The industry's high-end demand for lightweight.

The invention provides a high-strength, toughness, heat-resistant Mg-Gd-Y alloy suitable for gravity casting and a preparation method thereof. The alloy has chemical components in mass percentages of 4.0-10.0% RE, 2.0-6.0% Zn, and 0.5-1.2% Al , 0.1-0.3% Mn, 0.01-0.08% M, and the balance is Mg; wherein M is Ti, one or two elements in B. Preparation method: (1) batching according to the composition of Mg‑Gd‑Y alloy; (2) melting industrial pure magnesium ingot; (3) heating up to 700 °C, mixing industrial pure zinc, Mg‑Gd, Mg‑Y and Mg‑ Mn master alloy melting; (4) heating up to 730 ° C, adding industrial pure aluminum ingots, Al-Ti, Al-Ti-B, Al-B master alloys are all melted, and refined to obtain magnesium alloy melt; (5) Gravity casting ; (6) Secondary solid solution and artificial aging treatment. After gravity casting, secondary solution treatment and artificial aging heat treatment, the alloy of the present invention has a room temperature tensile strength of 298MPa and an elongation of 16%; a high temperature tensile strength of 216MPa and an elongation of 22% at 200°C, meeting the aviation Aerospace, military, automotive and other industries have high-end demands for lightweight development.

The invention discloses a high-strength, toughness, heat-resistant die-casting Mg-Gd-Y alloy and a preparation method thereof. The chemical components of the alloy are: 3.0-7.0% RE, 1.2-4.2% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01-0.08% M, the balance is Mg and other inevitable impurities, wherein RE is the combined element of Gd and Y, M is Ti, and at least one element of B. After the high-strength, toughness and heat-resistant die-casting Mg-Gd-Y alloy of the present invention is pressure-cast, the room temperature tensile strength of the die-cast alloy is over 282 MPa, the elongation is over 10%, the high-temperature tensile strength at 200°C is over 190 MPa, and the elongation is over 190 MPa. It is more than 15.0%, and can be used without aging and solution heat treatment, meeting the high-end demand for lightweight development in aerospace, automotive, telecommunications and other industries.

The invention provides a gravity-cast high-strength and tough heat-resistant Mg-Y-Er alloy and a preparation method thereof. The alloy has a chemical composition in mass percent of: 4.0-10.0% RE, 2.0-6.0% Zn, 0.5-1.2% Al, 0.1 ~0.3% Mn, 0.01~0.08% M, and the balance is Mg; where M is Ti, one or two elements in B. Preparation method: (1) batching according to Mg-Y-Er alloy composition; (2) melting industrial pure magnesium ingot; (3) heating up to 700°C, mixing industrial pure zinc, Mg-Y, Mg-Er and Mg-Er Mn master alloy melting; (4) heating up to 730 ° C, adding industrial pure aluminum ingots, Al-Ti, Al-Ti-B, Al-B master alloys are all melted, and refined to obtain magnesium alloy melt; (5) Gravity casting ; (6) Secondary solid solution and artificial aging treatment. After gravity casting, secondary solution treatment and artificial aging heat treatment, the alloy of the present invention has a room temperature tensile strength of 296MPa and an elongation of 18%; a high temperature tensile strength of 212MPa and an elongation of 23% at 200°C, meeting aviation Aerospace, military, automotive and other industries have high-end demands for lightweight development.

The invention discloses a high-strength, toughness, heat-resistant Mg-Y alloy suitable for gravity casting and a preparation method thereof. The alloy chemical composition mass percent content is: 4.0-8.0% Y, 3.0-6.0% Zn, 0.5-1.2% Al, 0.1-0.3% Mn, 0.01-0.08% M, the balance being Mg and other unavoidable impurities, wherein M is at least one element among Ti and B. After gravity casting, secondary solution treatment and artificial aging heat treatment, the high-strength, toughness and heat-resistant cast Mg-Y alloy of the present invention has a room temperature tensile strength of more than 260 MPa and an elongation of more than 18%; high temperature tensile strength at 200°C It is more than 185MPa, and the elongation rate is more than 25%, which meets the high-end demand for lightweight development in aerospace, military industry, automobile and other industries.