Alkaline-earth element modified heat-resistant magnesium alloy and preparation method thereof

An alkaline earth element, magnesium alloy technology, applied in the field of metal materials, can solve the problem that AS series heat-resistant magnesium alloys are difficult to adapt to industrial application requirements, and achieve the effects of high-temperature tensile strength, improved plasticity, and high room temperature tensile strength.

Inactive Publication Date: 2015-01-28
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical bottleneck problem, the present invention provides a heat-resistant magnesium alloy modified by alkaline earth elements, which has the characteristics of high specific strength, high specific modulus, and good heat resistance, and solves the problem of AS-based heat-resistant magnesium alloys in the prior art. It is difficult to adapt to the problem of industrial application requirements

Method used

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  • Alkaline-earth element modified heat-resistant magnesium alloy and preparation method thereof
  • Alkaline-earth element modified heat-resistant magnesium alloy and preparation method thereof
  • Alkaline-earth element modified heat-resistant magnesium alloy and preparation method thereof

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Embodiment 1

[0028] An alkaline-earth heat-resistant magnesium alloy, the composition mass percent of which is: Al 2.9%, Si 1.1%, Mn 0.09%, Sr 0.2%, the total amount of impurity elements is less than 0.04%, and the rest is Mg.

[0029] A method for preparing an alkaline earth heat-resistant magnesium alloy, comprising the following steps:

[0030] a) Mix industrially pure magnesium ingot (99.97wt.%), pure aluminum ingot (99.95wt.%), magnesium-silicon master alloy (Mg-30Si) and magnesium-strontium master alloy (Al-10Sr) according to the above mass percentage, and Preheat to 130-170 o C;

[0031] b) The above alloys are smelted in a crucible resistance furnace. In order to prevent the oxidation and combustion of the magnesium alloy, the melting and pouring process uses SF 6 +CO 2 Mixed gas protection;

[0032] c) Put the above pure magnesium into the preheated to 200 o C in a mild steel crucible, when the temperature reaches 680 oC When pure magnesium is completely melted, add ...

Embodiment 2

[0040] An alkaline-earth heat-resistant magnesium alloy, the composition mass percentage is: Al 3.3%, Si 1.0%, Mn 0.08%, Sr 0.5%, the total amount of impurity elements is less than 0.04%, and the rest is Mg.

[0041] Steps a) to e) of this embodiment are the same as those of a) to e) of Embodiment 1.

[0042] The alkaline earth heat-resistant magnesium alloy of the present embodiment has a tensile strength of 138MPa at room temperature, a yield strength of 112MPa, and an elongation of 6.1%; at 150 o C The tensile strength under high temperature conditions is 118MPa, the yield strength is 93MPa, and the elongation is 6.8%.

Embodiment 3

[0044] An alkaline-earth heat-resistant magnesium alloy, the composition mass percent of which is: Al 3.1%, Si 1.3%, Mn 0.11%, Sr 1.2%, the total amount of impurity elements is less than 0.04%, and the rest is Mg.

[0045] Steps a) to e) of this embodiment are the same as those of a) to e) of Embodiment 1.

[0046] The alkaline earth heat-resistant magnesium alloy of the present embodiment has a tensile strength of 148MPa at room temperature, a yield strength of 130MPa, and an elongation of 5.5%; at 150 o The tensile strength under high temperature conditions is 126MPa, the yield strength is 109MPa, and the elongation is 6.4%.

[0047] Carry out T6 heat treatment to the AS31J alkaline earth magnesium alloy prepared in embodiment 1-3 and the prior art AS31 magnesium alloy without modification treatment, at room temperature and 150 o The tensile properties were tested under high temperature conditions, and the results are shown in Table 1 below.

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Abstract

The invention relates to an alkaline-earth element modified heat-resistant magnesium alloy. The magnesium alloy comprises the following components by weight percent: 2.5-3.4% of Al, 0.5-1.4% of Si, 0.05-0.14% of Mn, 0.05-1.54% of Sr and the balance of Mg. The magnesium alloy is modified by adding Mg-Si and Al-Sr intermediate alloys to the magnesium alloy by a smelting method, and T6 heat treatment is carried out on the obtained as-cast heat-resistant magnesium alloy. Compared with the prior art, the prepared heat-resistant magnesium alloy has higher room temperature tensile strength and high temperature tensile strength and better plasticity.

Description

technical field [0001] The invention relates to a magnesium alloy, in particular to a heat-resistant magnesium alloy modified by alkaline earth elements and a preparation method thereof, belonging to the field of metal materials. Background technique [0002] As the lightest metal structural material, magnesium alloy has high specific strength and specific stiffness, good casting performance, good machining performance and damping characteristics, and has wide application prospects. Among them, the new lightweight high-strength heat-resistant magnesium alloy is the third The best choice for the generation of piston materials. [0003] Mg-Al-Si heat-resistant magnesium alloy has the characteristics of good high temperature performance and obvious cost advantage, so its research and development, like other Mg-Al heat-resistant magnesium alloys, is being widely recognized at home and abroad. Attention and attention. Although a lot of fruitful research work has b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C1/03C22F1/06
CPCC22C1/03C22C23/02C22F1/06
Inventor 王旭王宝刚张国福刘峰
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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