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Mg-Sn-Si-La series heat-resistant magnesium alloy and preparation method thereof

A mg-sn-si-la, magnesium alloy technology, applied in the field of heat-resistant magnesium alloy and its preparation, can solve the problems of high energy consumption, high processing temperature, long time, etc., and achieve excellent heat resistance and creep resistance Improved performance and simple manufacturing method

Inactive Publication Date: 2012-05-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, Chinese Patent Publication No. 101161840 discloses a Mg-Sn-Si alloy, and using high temperature (490 ~ 550 ° C) for a long time (1 ~ 4h) insulation method can effectively change the eutectic Mg 2 The morphology of Si phase, but this method has high treatment temperature, long time and high energy consumption

Method used

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  • Mg-Sn-Si-La series heat-resistant magnesium alloy and preparation method thereof
  • Mg-Sn-Si-La series heat-resistant magnesium alloy and preparation method thereof
  • Mg-Sn-Si-La series heat-resistant magnesium alloy and preparation method thereof

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Embodiment 1

[0030] The preparation of embodiment 1Mg-5Sn-2Si-2La alloy

[0031] The raw materials used in this embodiment include pure Mg, pure Sn, pure Si and Mg-20% La master alloy. The preparation method is: melting 332g of pure Mg at 770°C, utilizing a covering agent (component is 45wt.% MgCl 2 , 35wt.% KCl, 10wt.% CaF 2 , 10wt.%NaCl) 2g is covered to prevent magnesium from burning. After the pure Mg is melted, 20g of pure Sn, 8g of pure Si and 40g of Mg-20% La master alloy are sequentially added according to the formula (Sn 5%, Si 2%, La 2%, and the rest is Mg). Continue to keep warm at 770°C for 10 minutes, and then stir the melt to ensure that the alloying elements are evenly dispersed in the melt. After another 10 minutes of incubation, use C 2 Cl 6Refining the melt. Then the magnesium melt is cast into a metal mold preheated at 300°C to form a Mg-5Sn-2Si-2La alloy. For comparison, Mg-5Sn and Mg-5Sn-2Si alloys were also prepared in this example. In addition, the most widel...

Embodiment 2

[0041] The preparation of embodiment 2Mg-3Sn-1Si-1La alloy

[0042] The raw materials used in this embodiment include pure Mg, pure Sn, pure Si and Mg-20% La master alloy. The preparation method is: melting 364g of pure Mg at 750°C, utilizing a covering agent (component is 45wt.% MgCl 2 , 35wt.% KCl, 10wt.% CaF 2 , 10wt.%NaCl) 2g is covered to prevent magnesium from burning. After the pure Mg is melted, 12g of pure Sn, 4g of pure Si and 20g of Mg-20% La master alloy are sequentially added according to the formula (Sn 3%, Si 1%, La 1%, and the rest is Mg). Continue to keep warm at 750°C for 10 minutes, and then stir the melt to ensure that the alloying elements are evenly dispersed in the melt. After continuing to keep warm for 10 minutes, use C 2 Cl 6 Refining the melt. Then the magnesium melt was cast into a metal mold preheated at 300° C. to obtain a Mg-3Sn-1Si-1La alloy. For comparison, Mg-3Sn-1Si and the most widely used AZ91 (Mg-9Al-1Zn) alloy samples in industrial...

Embodiment 3

[0046] The preparation of embodiment 3Mg-8Sn-3Si-3La alloy

[0047] The raw materials used in this embodiment include pure Mg, pure Sn, pure Si and Mg-20% La master alloy. The preparation method is: melting 296g of pure Mg at 800°C, utilizing a covering agent (component is 45wt.% MgCl 2 , 35wt.% KCl, 10wt.% CaF 2 , 10wt.%NaCl) 2g is covered to prevent magnesium from burning. After the pure Mg is melted, 32g of pure Sn, 12g of pure Si and 60g of Mg-20% La master alloy are sequentially added according to the formula (Sn 8%, Si 12%, La 3%, and the rest is Mg). Continue to keep warm at 800°C for 10 minutes, and then stir the melt to ensure that the alloying elements are evenly dispersed in the melt. After continuing to keep warm for 10 minutes, use C 2 Cl 6 Refining the melt. Then the magnesium melt was cast into a metal mold preheated at 300° C. to obtain a Mg-8Sn-3Si-3La alloy. For comparison, Mg-8Sn-3Si and the most widely used AZ91 (Mg-9Al-1Zn) alloy samples in industri...

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Abstract

The invention discloses an Mg-Sn-Si-La series heat-resistant magnesium alloy and a preparation method thereof. The heat-resistant magnesium alloy comprises the following components: 3 to 8 percent of Sn, 1 to 3 percent of Si, 1 to 3 percent of La and the balance of Mg. During smelting, Sn, Si, Mn and La are added into magnesium melt in a form of pure Sn, pure Si and Mg-20 percent La intermediate alloy respectively, and the smelting temperature range is 750 to 800 DEG C. The Sn and the Si are used as alloying elements for generating heat-resistant reinforcement phases Mg2Sn and Mg2Si with highstability, the La is added to control the form of the Mg2Si and fulfill the purpose of thinning, and meanwhile, the compounded La can generate a La5Si4 alloy phase. The heat-resistant magnesium alloydoes not contain Al; the preparation method for the heat-resistant magnesium alloy is simple, low in cost and easy to control the adding amount; and the heat-resistant magnesium alloy shows excellenthigh-temperature creep resistance.

Description

technical field [0001] The invention relates to a heat-resistant magnesium alloy containing tin and silicon and a preparation method thereof, in particular to a Mg-Sn-Si-La series heat-resistant magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has incomparable advantages over other metal structural materials in the "weight reduction, energy saving and emission reduction" of automobiles due to its unique light weight characteristics. However, the poor heat resistance (thermal strength and high-temperature creep resistance) of magnesium alloys limits its application in the automotive field. How to improve the thermal strength and high-temperature creep resistance of magnesium alloys and develop new types of Hot magnesium alloys have always been an important issue of great concern to the majority of researchers. Among them, the main heat-resistant magnesium alloy systems are Mg-Al system and Mg-RE (rare earth element) system. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03
Inventor 杜军李文芳麦嘉浩林上广吴资湧
Owner SOUTH CHINA UNIV OF TECH
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