Deformation mechanisms of Mg-3Al-1Zn alloy by polycrystal plasticity modeling  

采用多晶塑性模型研究Mg-3A1-1Zn合金的变形机制（英文）

作　　者：尹德良[1] 刘金强[1] 吴冰[1] 

机构地区：[1]南京理工大学材料科学与工程学院,南京210094

出　　处：《Transactions of Nonferrous Metals Society of China》2015年第7期2188-2194,共7页中国有色金属学报（英文版）

基　　金：Project(51201092)supported by the National Natural Science Foundation of China

摘　　要：A polycrystal plasticity model was developed to analyze the room-temperature deformation behaviors of Mg-3A1-1Zn alloy（AZ31）.The uniaxial tension and compression tests at room temperature were conducted using cast and extruded AZ31 rods with different textures and combined with the proposed model to reveal the deformation mechanisms.It is shown that,different flow curves of two specimens under tension and compression tests can be simulated by this model.The flow curves of AZ31 extrusions exhibit different shapes for tension and compression due to different activities of tensile twinning and pyramidalc＋a slip.The metallographic and TEM observations showed the equal twinning activities at the initial stage in tension and compression tests and the occurrence of pyramidalc＋a slip in compression of as-cast Mg-3A1-1Zn alloy with increasing the strain,which is consistent with the simulated results by the proposed model.采用一种多晶塑性模型分析Mg-3A1-1Zn合金的室温变形行为。使用铸态和挤压态两种织构类型的AZ31镁合金棒料进行室温单向拉伸和压缩试验,并与提出的模型相结合来揭示该合金的变形机制。结果表明:多晶塑性模型可以成功地模拟镁合金试样拉伸和压缩曲线的差异。挤压态AZ31镁合金拉伸和压缩曲线形状的差异是拉伸孪生和锥面<c+a>滑移的不同开动行为所致。金相和透射电镜(TEM)观察表明:铸态AZ31镁合金拉伸和压缩初期具有相同的孪生开动分数;随着应变的增加,在铸态压缩试样中发生了锥面<c+a>滑移,这与模拟结果相吻合。

关 键 词：Mg alloy deformation mechanism polycrystal plasticity model TEXTURE 

分 类 号：TG146.22[一般工业技术—材料科学与工程]