挤压铸造Mg-9Gd-1Y-0.5Zr活塞的组织与性能

袁竭; 王渠东; 陈长江; 尹冬弟; 叶兵

doi:10.15980/j.tzzz.2012.10.014

压力铸造 | 浏览量 : 0 下载量: 128 CSCD: 1

导出
分享
收藏
专辑

挤压铸造Mg-9Gd-1Y-0.5Zr活塞的组织与性能
Microstructure and Properties of Squeezing Casting Mg-9Gd-1Y-0.5Zr Alloy Piston
2012年32卷第10期页码：907-911
纸质出版日期： 2012 ，
DOI： 10.15980/j.tzzz.2012.10.014

扫描看全文

[1]袁竭,王渠东,陈长江,尹冬弟,叶兵.挤压铸造Mg-9Gd-1Y-0.5Zr活塞的组织与性能[J].特种铸造及有色合金,2012,32(10):907-911.

Yuan Jie, Wang Qudong, Chen Changjiang, et al. Microstructure and Properties of Squeezing Casting Mg-9Gd-1Y-0.5Zr Alloy Piston[J]. Special Casting & Nonferrous Alloys, 2012,32(10):907-911.
[1]袁竭,王渠东,陈长江,尹冬弟,叶兵.挤压铸造Mg-9Gd-1Y-0.5Zr活塞的组织与性能[J].特种铸造及有色合金,2012,32(10):907-911. DOI： 10.15980/j.tzzz.2012.10.014.

Yuan Jie, Wang Qudong, Chen Changjiang, et al. Microstructure and Properties of Squeezing Casting Mg-9Gd-1Y-0.5Zr Alloy Piston[J]. Special Casting & Nonferrous Alloys, 2012,32(10):907-911. DOI： 10.15980/j.tzzz.2012.10.014.

摘要

挤压铸造了Mg-9Gd-1Y-0.5Zr（GW91）活塞

研究了固溶时效态（T6）活塞顶部及裙部的力学性能

以及在200～300℃的蠕变性能。结果表明

活塞经过固溶时效处理后

晶粒内部析出相均匀析出

顶部和裙部平均晶粒尺寸分别为140、80μm;T6态活塞的抗拉强度随温度增加而降低

当温度为300℃时

活塞顶部及裙部抗拉强度分别达到210、223MPa;T6态活塞稳态蠕变速率随温度及应力增加而增大

在300℃、50MPa蠕变条件下

活塞顶部及裙部稳态蠕变速率分别为7.81×10-8s-1、1.45×10-7s-1

蠕变100h后蠕变量分别为2.8%、3.0%

优于现阶段商用活塞材料Al-Si合金的高温抗拉强度和抗蠕变性能。

Abstract

The Mg-9Gd-1Y-0.5Zr(GW91) alloy piston was produced by squeezing casting.The mechanical properties of the samples cut from piston top and skirt at the peak-aged condition(T6) and its creep resistance at 200~300 ℃ were investigated.The results reveal that precipitates in grain is uniformly distributed in the T6 treated piston

and the grain size in piston top and skirt treated by T6 reaches 140 μm and 80μm

respectively.Meanwhile

the tensile strength of piston is decreased with increasing in temperature

and the ultimate tensile strength(UTS) of piston top and skirt are 210 MPa and 223 MPa

respectively

at 300 ℃.The steady-stage creep rate of piston is increased with increasing in temperature and applied stress.The steady-stage creep rate of piston top and skirt are 7.81×10-8 s-1 and 1.45×10-7 s-1

and total creep strain after 100 h are 2.8% and 3.0%

respectively

at 300 ℃ and 50 MPa

evidently superior to those of commercial Al-Si alloy.