Mechanical response and texture evolution of AZ31 alloy at large strains for different strain rates and temperatures
Mechanical response and texture evolution of AZ31 alloy at large strains for different strain rates and temperatures
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DOI：
10.1016/j.ijplas.2010.08.009
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发表时间：
2011-05-01
影响因子：
9.8
通讯作者：
Mishra, Raja K.
中科院分区：
文献类型：
--
作者：
Khan, Akhtar S.;Pandey, Amit;Mishra, Raja K.
为了研究材料在不同应变率下的有限变形行为，测量了AZ31镁合金板材在沿轧制方向(RD)、与轧制方向成45°(DD)、与轧制方向成90度(TD)的单轴(拉伸和压缩)和多轴(简单剪切)载荷下的响应。和垂直于板材(ND)的大应变。该材料在室温和高温下表现出正的应变率敏感性(SRS)；在高温和较低的应变率下SRS更加明显。材料在室温拉伸载荷下的r值在应变速率较低时较高。报道了几个失效试件在拉伸和简单剪切下的织构测量，这些试件在约20%的等效应变的有限塑性变形后。所得到的材料表现出具有相同比例的颗粒的强纤维，其c轴稍微偏离板材的法线朝向+Rd和Rd。沿轧制方向(RD)拉伸加载后得到的极图表明，即使在低应变下，材料的织构也会增强，c轴垂直于板材平面，棱柱面在大部分晶粒中排列。然而，沿Td方向的拉伸加载轴并没有导致类似的织构强化；c轴的分布似乎与原始状态几乎没有变化。面内压缩后得到的极图使颗粒的c轴平行于加载方向。简单剪切加载后的极图表明，c轴旋转位于板材平面上，与板材平面上45度外的压力轴一致。(C)2010爱思唯尔有限公司。保留所有权利。
In order to study the behavior of material under finite deformation at various strain rates, the responses of AZ31 Mg sheet are measured under uniaxial (tension and compression) and multiaxial (simple shear) loadings along rolling direction (RD), 45 degrees to rolling direction (DD), 90 degrees to rolling direction (TD). and normal to the sheet (ND) to large strains. The material exhibits positive strain rate sensitivity (SRS) at room and elevated temperatures; the SRS is more pronounced at high temperatures and lower strain rates. The r-value of the material under tensile loading at room temperatures is higher in TO at lower strain rate. Texture measurements on several failed specimens are reported under tension and simple shear after finite plastic deformation of about 20% equivalent strain. The as-received material exhibits a strong fiber with equal fractions of grains having the c-axis slightly tilted away from the sheet normal towards both +RD and RD. Pole figures obtained after tensile loading along the rolling direction (RD) show that the texture of the material strengthens even at low strains, with c-axis perpendicular to the sheet plane and prism planes lining up in a majority of grains. However, the tensile loading axis along TD does not lead to similar texture strengthening; the c-axis distribution appears to be virtually unchanged from the virgin state. The pole figures obtained after in-plane compression along RD brings the c-axes of the grains parallel to the loading direction. The pole figures after simple shear loading show that the c-axis rotates to lie on the sheet plane consistent with a compression axis 45 degrees away on the sheet plane. (C) 2010 Elsevier Ltd. All rights reserved.