Al-Zn-Mg alloy and preparation method thereof

Abstract

The invention relates to an Al-Zn-Mg alloy, which comprises the following components: 1-3wt% of Zn, 3-9wt% of Al, 0.5-0.9wt% of Ti, 0.07-0.14wt% of Zr, 0.02-0.11wt% of Re and the balance of iron and inevitable impurities. The alloy can also comprise Y, Mn, Sr and Nb. The strength of the Al-Zn-Mg alloy provided by the invention is improved by adding Zn, Al, Ti, Zr and Re into Mg base, and the goodstrength effect is realized by adding the components of different proportions; and in the preparation method, the Al-Zn-Mg alloy precipitate is hardened by three steps of ageing treatment, so that the hardness of the obtained Al-Zn-Mg alloy is very high.

Description

technical field

[0001] The invention relates to metal alloys, in particular to an aluminum-zinc-magnesium alloy and a preparation method thereof. Background technique

[0002] Aluminum alloy is a general term for alloys based on aluminum. The main alloying elements of aluminum alloy are copper, silicon, magnesium, zinc, manganese, and the secondary alloying elements are nickel, iron, titanium, chromium, lithium, etc. Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. Aluminum alloy has low density, but relatively high strength, which is close to or exceeds high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel. .

[0003] Accor...

Examples

Embodiment 1

[0075] A method for preparing an aluminum-zinc-magnesium alloy, comprising the steps of:

[0076] (a) Prepare a molten body of magnesium-based alloy, the molten body is composed of the following: 3wt% zinc, 3wt% aluminum, 0.9wt% titanium, 0.07wt% zirconium, 0.11wt% rhenium, 92.92wt% magnesium, and the rest also include Other unavoidable impurities; according to the formula, put the preheated alloy ingot into the crucible for melting to obtain a solidified body, and the melting temperature is 700°C;

[0077] (b) Heating up to 750°C, stirring and refining the solidified solid for 4 minutes, stopping stirring, and standing for 20 minutes;

[0078] (c) cooling down to 650°C, and then extruding the solidified body to obtain a forged product, the extrusion speed being 15mm / min;

[0079] (d) Install the furnace at 250°C, heat up to 350°C, keep warm for 2.2 hours, then continue to heat up to 450°C, hold for 22 hours, and quench in 50°C water after being out of the furnace; and

[00...

Embodiment 2

[0082](a) Prepare a melt of magnesium-based alloy, said melt is composed of the following: 1wt% zinc, 9wt% aluminum, 0.5wt% titanium, 0.14wt% zirconium, 0.02wt% rhenium, 89.34wt% magnesium, and the rest also include Other unavoidable impurities; according to the formula, put the preheated alloy ingot into the crucible for melting to obtain a solidified body, and the melting temperature is 650°C;

[0083] (b) heating up to 705°C, stirring and refining the solidified solid for 10 minutes, stopping the stirring, and standing for 16 minutes;

[0084] (c) cooling down to 650°C, and then extruding the solidified body to obtain a forged product, the extrusion speed being 150mm / min;

[0085] (d) Install the furnace at 280°C, heat up to 320°C, keep warm for 4 hours, continue to heat up to 400°C, keep warm for 17 hours, and quench in 80°C water after coming out of the furnace; and

[0086] (e) Aging treatment: first place at 20°C for 7h, then at 150°C for 4h, and finally at 120°C for 6...

Embodiment 3

[0088] A method for preparing an aluminum-zinc-magnesium alloy, comprising the steps of:

[0089] (a) Prepare a melt of magnesium-based alloy, according to the formula: zinc 3wt%, aluminum 3wt%, titanium 0.9wt%, zirconium 0.07wt%, rhenium 0.11wt%, yttrium 0.14wt%, manganese 0.03wt%, strontium 0.23wt% %, 0.02wt% niobium, including 92.4wt% magnesium, and the rest are unavoidable impurities. The preheated alloy ingot is put into a crucible for melting to obtain a solidified body, and the melting temperature is 667°C;

[0090] (b) heating up to 705°C, stirring and refining the solidified solid for 10 minutes, stopping the stirring, and standing for 16 minutes;

[0091] (c) cooling down to 650°C, then extruding the solidified body to obtain a forged product, the extrusion speed being 120mm / min;

[0092] (d) Install the furnace at 263°C, raise the temperature to 333°C, continue to heat up to 445°C after holding for 3 hours, hold for 20 hours, and quench in water at 62°C after comin...

technical field

[0001] The invention relates to metal alloys, in particular to an aluminum-zinc-magnesium alloy and a preparation method thereof. Background technique

[0002] Aluminum alloy is a general term for alloys based on aluminum. The main alloying elements of aluminum alloy are copper, silicon, magnesium, zinc, manganese, and the secondary alloying elements are nickel, iron, titanium, chromium, lithium, etc. Aluminum alloy is the most widely used non-ferrous metal structural material in industry, and has been widely used in aviation, aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. Aluminum alloy has low density, but relatively high strength, which is close to or exceeds high-quality steel. It has good plasticity and can be processed into various profiles. It has excellent electrical conductivity, thermal conductivity and corrosion resistance. It is widely used in industry, and its usage is second only to steel. .

[0003] Accor...

Examples

Embodiment 1

[0075] A method for preparing an aluminum-zinc-magnesium alloy, comprising the steps of:

[0076] (a) Prepare a molten body of magnesium-based alloy, the molten body is composed of the following: 3wt% zinc, 3wt% aluminum, 0.9wt% titanium, 0.07wt% zirconium, 0.11wt% rhenium, 92.92wt% magnesium, and the rest also include Other unavoidable impurities; according to the formula, put the preheated alloy ingot into the crucible for melting to obtain a solidified body, and the melting temperature is 700°C;

[0077] (b) Heating up to 750°C, stirring and refining the solidified solid for 4 minutes, stopping stirring, and standing for 20 minutes;

[0078] (c) cooling down to 650°C, and then extruding the solidified body to obtain a forged product, the extrusion speed being 15mm / min;

[0079] (d) Install the furnace at 250°C, heat up to 350°C, keep warm for 2.2 hours, then continue to heat up to 450°C, hold for 22 hours, and quench in 50°C water after being out of the furnace; and

[00...

Embodiment 2

[0082](a) Prepare a melt of magnesium-based alloy, said melt is composed of the following: 1wt% zinc, 9wt% aluminum, 0.5wt% titanium, 0.14wt% zirconium, 0.02wt% rhenium, 89.34wt% magnesium, and the rest also include Other unavoidable impurities; according to the formula, put the preheated alloy ingot into the crucible for melting to obtain a solidified body, and the melting temperature is 650°C;

[0083] (b) heating up to 705°C, stirring and refining the solidified solid for 10 minutes, stopping the stirring, and standing for 16 minutes;

[0084] (c) cooling down to 650°C, and then extruding the solidified body to obtain a forged product, the extrusion speed being 150mm / min;

[0085] (d) Install the furnace at 280°C, heat up to 320°C, keep warm for 4 hours, continue to heat up to 400°C, keep warm for 17 hours, and quench in 80°C water after coming out of the furnace; and

[0086] (e) Aging treatment: first place at 20°C for 7h, then at 150°C for 4h, and finally at 120°C for 6...

Embodiment 3

[0088] A method for preparing an aluminum-zinc-magnesium alloy, comprising the steps of:

[0089] (a) Prepare a melt of magnesium-based alloy, according to the formula: zinc 3wt%, aluminum 3wt%, titanium 0.9wt%, zirconium 0.07wt%, rhenium 0.11wt%, yttrium 0.14wt%, manganese 0.03wt%, strontium 0.23wt% %, 0.02wt% niobium, including 92.4wt% magnesium, and the rest are unavoidable impurities. The preheated alloy ingot is put into a crucible for melting to obtain a solidified body, and the melting temperature is 667°C;

[0090] (b) heating up to 705°C, stirring and refining the solidified solid for 10 minutes, stopping the stirring, and standing for 16 minutes;

[0091] (c) cooling down to 650°C, then extruding the solidified body to obtain a forged product, the extrusion speed being 120mm / min;

[0092] (d) Install the furnace at 263°C, raise the temperature to 333°C, continue to heat up to 445°C after holding for 3 hours, hold for 20 hours, and quench in water at 62°C after comin...

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