Development of Heat Resistant Mg-RE Alloy Piston

Chen Changjiang; Wang Qudong; Yin Dongdi

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Development of Heat Resistant Mg-RE Alloy Piston
Vol. 30, Issue 5, Pages: 455-458(2010)
Published： 2010 ，
DOI：

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[1]陈长江,王渠东,尹冬弟.镁-稀土耐热镁合金活塞的开发研究[J].特种铸造及有色合金,2010,30(05):455-458+389.

Chen Changjiang, Wang Qudong, Yin Dongdi. Development of Heat Resistant Mg-RE Alloy Piston. [J]. Special Casting & Nonferrous Alloys 30(5):455-458(2010)
[1]陈长江,王渠东,尹冬弟.镁-稀土耐热镁合金活塞的开发研究[J].特种铸造及有色合金,2010,30(05):455-458+389. DOI：

Chen Changjiang, Wang Qudong, Yin Dongdi. Development of Heat Resistant Mg-RE Alloy Piston. [J]. Special Casting & Nonferrous Alloys 30(5):455-458(2010) DOI：

摘要

采用Mg-11Y-5Gd-2Zn-0.5Zr镁合金重力铸造发动机活塞

确定了浇注温度、模具温度、热处理工艺等参数。对镁合金活塞本体的组织研究表明

原始铸态合金组织中有大量的第二相分布于晶界处

经过固溶和时效热处理

在晶界处析出大量的层片状析出相。在时效态

活塞裙部的硬度（HV）达到131.4;活塞顶部的高温抗拉强度大

在350℃时的抗拉强度为161.9MPa;在250℃、80MPa条件下经过100h镁合金活塞材料的蠕变变形量只有0.428%;Mg-11Y-5Gd-2Zn-0.5Zr镁合金活塞的密度为1.995g.cm-3

100℃时比热容为850J.kg-1.K-1

室温热导率为23W.m-1.K-1

20～100℃的线膨胀系数为25.6×10-6K-1。

Abstract

Heat resistant Mg-RE （Mg-11Y-5Gd-2Zn-0.5Zr） alloy engine piston was produced by gravity casting

and the processing parameters

such as pouring temperature

preheating temperature of the mould and heat treatment conditions

were optimized.Meanwhile

the microstructure of alloy piston was observed by optical microscope

SEM （scanning electron microscope）.The results reveal that there exist amounts of secondary phases distributed along grain boundary in as-cast microstructure

while amounts of lamellar phases are precipitated from grain boundary after solid solution and ageing treatment.The Vickers-hardness of aged alloy piston shirt reaches 131.4

and high temperature tensile strength of piston top exhibits excellent with 161.9MPa at 350℃.In addition

creep strain of piston top is only 0.428% at 250℃/80MPa for 100 hours.The density

specific heat capacity at 100℃

thermal conductivity at room temperature and linear expansion coefficient at 20～100℃ reach 1.995g/cm3

850J/（kg·K）

23W/（m·K） and 25.6×10-6/K

respectively.