The role of microstructure and texture in controlling mechanical properties of AZ31B magnesium alloy processed by I-ECAP
The role of microstructure and texture in controlling mechanical properties of AZ31B magnesium alloy processed by I-ECAP
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DOI：
10.1016/j.msea.2015.04.055
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发表时间：
2015-06-25
期刊：
影响因子：
6.4
通讯作者：
Olejnik, Lech
中科院分区：
文献类型：
--
作者：
Gzyl, Michal;Rosochowski, Andrzej;Olejnik, Lech
采用增量等径角挤压(I-ECAP) +热处理等工艺路线对AZ31B镁合金的力学性能进行了改善。研究了提高合金延展性和强度的可能策略。A和B-C两种加工方式表明，织构对室温下的力学性能起主导作用。I-ECAP经C路四次退火后，真应变延展性提高至035。在拉伸试验中，拉伸孪晶对容纳应变很重要，这导致了非常好的硬化行为。在150℃下，将I-ECAP中晶粒细化到0.8 μ m，使其屈服强度提高到300 MPa。在150℃下退火后，其组织和性能稳定，断口真应变提高到0.2，且强度不降低。(C) 2015年作者。Elsevier B.V.出版
Mechanical properties of AZ31B magnesium alloy were modified in this work by various processing routes of incremental equal channel angular pressing (I-ECAP) followed by heat treatment. Possible strategies for improving ductility and strength of the alloy were investigated. Processing by routes A and B-C showed that texture plays predominant role in controlling mechanical properties at room temperature. Four passes of I-ECAP by route C followed by annealing enhanced ductility up to 035 of true strain. It was found that tensile twinning was important in accommodating strain during tensile testing, which resulted in a very good hardening behaviour. The yield strength was improved to 300 MPa by refining grain size to 0.8 mu m in I-ECAP at 150 degrees C. The obtained structure and properties were shown to be stable up to 150 degrees C. True strain at fracture was increased to 0.2 after annealing at 150 degrees C without lowering strength. (C) 2015 The Authors. Published by Elsevier B.V.