Low temperature quasi-superplasticity of ZK60 alloy prepared by reciprocating extrusion
往复挤压ZK60合金的低温准超塑性(英文)作者机构：西安理工大学材料科学与工程学院西安710048 河南理工大学材料科学与工程学院焦作454003
出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)
年 卷 期：2012年第22卷第2期
页 面：255-261页
核心收录：
学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0813[工学-建筑学] 0703[理学-化学] 0802[工学-机械工程] 0814[工学-土木工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化]
基 金：Project (50271054) supported by National Natural Science Foundation of China Project (20070700003) supported by Ph.D. Programs Foundation of Ministry of Education of China Project (102102210031) supported by Science and Technologies Foundation of Henan,China Project (2010A430008) supported by Natural Science Foundation of Henan Educational Committee,China
主 题：ZK60 Mg alloy reciprocating extrusion quasi-superplasticity intragranular sliding grain boundary sliding
摘 要：Fine-grained ZK60 alloy was prepared by 2-pass reciprocating extrusion, and the low temperature superplasticity was conducted in a temperature range from 443 to 523 K and an initial strain rate ranging from 3.3×10^-4 to 3.3×10-2^s^-1. The results show that the alloy has an equiaxed grain structure with an average grain size of about 5.0μm, and the sizes of broken secondary particles and precipitates are no more than 175 and 50 nm, respectively. The alloy exhibits quasi-superplasticity with a maximum elongation of 270% at 523 K and an initial strain rate of 3.3×10^-4 s^-1. The strain rate sensitivity m is less than 0.2 at 443 and 473 K, and it is 0.42 at 523 K. The apparent activation energies at temperature below 473 K and at 523 K are less than 63.2 and 110.6 kJ/mol, respectively At temperature below 473 K, mainly intragranular sliding contributes to superplastic flow. At 523 K, grain boundary sliding is the dominant deformation mechanism, and dislocation creep controlled by grain boundary diffusion is considered to be the main accommodation mechanism.
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