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23卷    第12期    总第177期    2013年12月

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文章编号:1004-0609(2013)12-3275-07
轧制工艺对Mg-10Gd-4.8Y-0.6Zr合金显微组织和力学性能的影响
袁武华,齐 欣,黄巧玲

(湖南大学 材料科学与工程学院,长沙 410083)

摘 要: Mg-10Gd-4.8Y-0.6Zr铸态合金经525 ℃、16 h均匀化退火后,在500 ℃轧制成总变形量为84%的板材,轧制后在200 ℃进行时效处理。观察合金的微观组织变化,并测试合金的力学性能。结果表明:轧制变形明显细化了晶粒尺寸,轧制后组织中存在方块相和长条状相;轧制初期组织中存在大量孪晶,孪晶能很好地协调塑性变形,并诱发了孪生动态再结晶;随着轧制变形量的增大,孪晶数量减少,再结晶方式以晶界弓出形核为主。轧制T5态合金具有优异的高温力学性能,200、250、300和350 ℃时抗拉强度分别为392、381、251和112 MPa,350 ℃拉伸时伸长率达到107.0%。

 

关键字: Mg-Gd-Y-Zr合金;热轧;微观组织;力学性能

Effect of rolling process on microstructure and mechanical properties of Mg-10Gd-4.8Y-0.6Zr alloy
YUAN Wu-hua, QI Xin, HUANG Qiao-ling

School of Materials Science and Engineering, Hunan University, Changsha 410083, China

Abstract:The as-cast Mg-10Gd-4.8Y-0.6Zr alloy sheets were rolled at 500 ℃ with 84% total reduction after being homogenized at 525 ℃ for 16 h and then aged at 200 ℃. The microstructures and mechanical properties were investigated. The results show that the grain size can be effectively refined by rolling process, cuboid-shaped phases and strip-shaped phases exist after being rolled. A mass of twins exist after initially being rolled, they can harmonize the plastic deformation and cause twinning-induced DRX. The number of twins decreases with the increase of rolling reduction and the DRX mode turns into grain boundary bulging mechanism. The rolled-T5 alloy has excellent elevated temperature mechanical properties: the tensile strength at 200, 250, 300 and 350 ℃ are 392, 381, 251 and 112 MPa, respectively, and the elongation at 350℃ can reach 107.0%.

 

Key words: Mg-Gd-Y-Zr alloy; hot rolling; microstructure; mechanical properties

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

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

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