Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第11期    总第92期    2006年11月

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文章编号: 1004-0609(2006)11-1888-07
Mg-15Gd-0.6Zr合金的组织与力学性能
肖  阳, 张新明, 陈健美, 蒋  浩

(中南大学 材料科学与工程学院, 长沙 410083)

摘 要:  通过在Mg-Gd二元合金中添加少量的Zr后制备一种新型的Mg-15Gd-0.6Zr合金, 并对合金的微观组织、 时效特性和不同温度下的力学性能及拉伸断裂方式进行研究。 合金在非平衡凝固过程中容易形成MgxGd(x=2, 3, 5)相, 但用热处理的方法几乎不可能消除。 在合金的Cast-T5、 Cast-T6、 Ext-T5和Ext-T6的4种时效状态中, Ext-T5态达到峰值硬度的时间最短, 峰值硬度值最高; 而Cast-T5态的则相反。 合金具有较高的耐热强度和延伸率, 其在不同温度下的抗拉强度与WE54的相当, 而延伸率明显优于WE54及其它耐热镁合金的。 合金在25 ℃时的断裂方式以准解理断裂为主, 而250 ℃时的断裂方式以微孔聚集型断裂为主, 300 ℃和350 ℃时的断裂方式以典型的微孔聚集型断裂为主。

 

关键字:  Mg-Gd-Zr合金; 耐热镁合金; 微观组织; 力学性能; 时效特性; 断裂方式

Microstructures and mechanical properties of Mg-15Gd-0.6Zr alloy
XIAO Yang, ZHANG Xin-ming, CHEN Jian-mei, JIANG Hao

School of Materials Science and Engineering, Central South University, 
Changsha 410083, China

Abstract: A new Mg-15Gd-0.6Zr alloy was developed by adding minor Zr to Mg-Gd binary alloy. The microstructures, aging characteristics, mechanical properties and fracture modes at 25, 250, 300 and 350 ℃ were investigated. A large number of MgxGd (x=2, 3, 5) phases form due to non-equilbrium solidification which can be hardly eliminated by subsequent heat treatments. Among Cast-T5, Cast-T6, Ext-T5 and Ext-T6, the highest hardness in the shortest time is in the Ext-T5 temper, while the lowest hardness in the longest time is in the Cast-T5. The tensile strengths of the alloy at the studied temperatures are as high as that of WE54 alloy, but the elongations are higher than those of WE54 alloy and some other conventional heat resistant magnesium alloys. The fracture modes of quasi-cleavage and microviod coalescence are dominant at 25 and 250 ℃, respectively, while at 300 and 350 ℃, the typical microviod coalescence are observed.

 

Key words: Mg-Gd-Zr alloy; heat-resistant magnesium alloy; microstructures; mechanical
properties; aging characteristics; fracture mode

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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