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Heat-resistant rare-earth magnesium alloy containing silicon, zinc and Gd(-Y) and preparation method thereof

A rare earth magnesium and alloy technology, applied in the field of metal materials, can solve the problems of inability to guarantee mechanical properties, inability to meet the application requirements of lightweight high temperature resistant parts, hindering dislocation slip, etc., to enhance the effect of fine grain strengthening and improve heat resistance. resistance and wear resistance, effect of grain size refinement

Inactive Publication Date: 2014-12-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Mg-10Gd-3Y-0.5Zr alloy reported by He Shangming in his doctoral dissertation "Research on Microstructure Evolution, Properties and Fracture Behavior of Mg-Gd-Y-Zr(-Ca) Alloy has strong tensile mechanical properties at room temperature , the tensile strength at room temperature in the T6 state is 366MPa, but the tensile strength drops rapidly to 230MPa at 300°C, which cannot meet the application requirements of lightweight high-temperature resistant parts; J.F.Nie in his "Enhanced age hardening response and creep resistance of Mg-Gd alloys containing Zn" pointed out that the addition of Zn can promote the aging strengthening effect of Gd element, and generate a large number of basal phases that can hinder dislocation slippage, which is beneficial to improve the high temperature tensile mechanical properties of the alloy; the published The Si-containing heat-resistant rare earth magnesium alloy patent (publication number CN103305738A) has good heat resistance and wear resistance at around 200°C through the strengthening effect of Si-containing intermetallic compounds in the crystal. However, the rare earth magnesium alloy in this patent Also in the working environment above 250 ℃ can not guarantee strong mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The alloy composition (percentage by weight) of the heat-resistant rare earth magnesium alloy containing silicon, zinc and Gd (-Y) involved in this embodiment is: 15% Gd, 3% Y, 0.1% Si, 2.5% Zn, 0% Zr, The total content of impurity elements is less than 0.02%, and the rest is Mg. Concrete preparation comprises the following steps:

[0027] (1) According to the above composition, select magnesium ingot, industrial pure Si powder, industrial pure Zn, Mg-Gd, Mg-Y master alloy to configure alloy raw materials.

[0028] (2) Smelt the raw materials configured in (1) above. First, preheat all the raw materials to 200°C in an oven, and then add kg of industrially pure magnesium into the resistance crucible furnace. 6 and CO 2 Mixed gas (SF 6 The volume percentage is 0.2%) and heated under protection. After the magnesium ingot is completely melted, add pure Si powder at 770°C, and the stirring time is 5min; Add pure Zn after lowering to 690°C; adjust the preset temperature o...

Embodiment 2

[0033] The alloy composition (percentage by weight) of the heat-resistant rare earth magnesium alloy containing silicon, zinc and Gd (-Y) involved in this embodiment is: 10% Gd, 6% Y, 5% Si, 0.1% Zn, 0.5% Zr, The total content of impurity elements is less than 0.02%, and the rest is Mg. Concrete preparation comprises the following steps:

[0034] (1) According to the above composition, select magnesium ingot, industrial pure Si powder, industrial pure Zn, Mg-Gd, Mg-Y and Mg-Zr master alloy to configure alloy raw materials.

[0035] (2) Smelt the raw materials configured in (1) above. First, preheat all raw materials to 225°C in an oven, then add commercially pure magnesium into a resistance crucible furnace, and 6 and CO 2 Mixed gas (SF 6 The volume percentage is 0.2%) and heated under the protection. After the magnesium ingot is completely melted, add pure Si powder at 780 ° C, and the stirring time is 5 minutes; after the stirring is completed, the preset temperature of t...

Embodiment 3

[0040] The alloy composition (percentage by weight) of the heat-resistant rare earth magnesium alloy containing silicon, zinc and Gd (-Y) involved in this embodiment is: 20% Gd, 0.5% Y, 2.5% Si, 5% Zn, 1% Zr, The total content of impurity elements is less than 0.02%, and the rest is Mg. Concrete preparation comprises the following steps:

[0041] (1) According to the above composition, select magnesium ingot, industrial pure Si powder, industrial pure Zn, Mg-Gd, Mg-Y and Mg-Zr master alloy to configure alloy raw materials.

[0042] (2) Smelt the raw materials configured in (1) above. First, preheat all the raw materials to 200°C in an oven, and then add commercially pure magnesium into the resistance crucible furnace. 6 and CO 2 Mixed gas (SF 6 The volume percentage is 0.2%) and heated under protection. After the magnesium ingot is completely melted, add pure Si powder at 770°C, and the stirring time is 5min; Add pure Zn after lowering to 700°C; adjust the preset temperatu...

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Abstract

The invention discloses heat-resistant rare-earth magnesium alloy containing silicon, zinc and Gd(-Y), and a preparation method thereof. The alloy comprises the following components in percentage by weight: 10-20% of Gd, 0.5-6% of Y, 0.1-5% of Si, 0.1-5% of Zn, 0-1% of Zr, less than 0.02% of all impurity elements, and the balance of Mg. The magnesium alloy disclosed by the invention is obtained by smelting and subsequent heat treatment, is simple in process and high in production efficiency, and has excellent characteristics of high strength, high abrasive resistance, good plasticity and the like at 200-300 DEG C due to existence of silicon, zinc and high-content Gd(-Y) rare-earth elements.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a heat-resistant rare earth magnesium alloy containing silicon, zinc and Gd(-Y) and a preparation method thereof. Background technique [0002] Among the existing engineering metals, the density of magnesium alloy is the smallest, about 2 / 3 of that of aluminum alloy and 1 / 4 of that of steel. The specific strength of magnesium alloy is higher than that of aluminum alloy and steel, slightly lower than that of fiber-reinforced plastic with the highest specific strength; the specific stiffness is equivalent to that of aluminum alloy and steel, much higher than that of fiber-reinforced plastic; in addition, magnesium alloy also has excellent vibration damping performance , electromagnetic shielding, thermal conductivity, etc., and has broad application potential in the fields of electronics, automobiles, aerospace and military industries. At present, the most successfully dev...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03
Inventor 吴玉娟萧柱华彭立明郑飞燕易轰容伟丁文江
Owner SHANGHAI JIAO TONG UNIV
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