挤压态AZ31镁合金温热拉伸性能的各向异性

发布时间：2018-01-30 22:38

本文关键词： 镁合金温热拉伸性能孪生断裂机制各向异性　出处：《中国有色金属学报》2017年01期 　论文类型：期刊论文

【摘要】：采用单向拉伸实验研究温热条件下挤压态AZ31镁合金板材5个不同方向的力学性能、显微组织、断口形貌。结果表明:挤压态镁合金力学性能具有明显的各向异性,170℃时,各向异性最明显,随着拉伸方向与挤压方向所呈角度的增大,抗拉强度从217 MPa增大到271 MPa,屈服强度却从174 MPa减小到71 MPa。镁合金在温热条件下变形机制为{1012}拉伸孪生、{1011}压缩孪生和{0001}基面a滑移;沿着不同角度拉伸时,变形机制有所不同。拉伸方向与挤压方向的角度小于45°时,挤压态镁合金表现为微孔聚集型的韧性断裂;且随着角度的增大,表现为韧-脆混合断裂,其中角度为67.5°时,镁合金以解理方式断裂。
[Abstract]:By means of tensile test of warm conditions of extruded AZ31 magnesium alloy sheet in 5 different directions of the mechanical properties, microstructure, fracture morphology. The results showed that the mechanical properties of magnesium alloy extrusion state has obvious anisotropy, 170 degrees, the most obvious anisotropy, with the tensile direction and the extrusion direction is angle increased and the tensile strength increases from 217 MPa to 271 MPa, the yield strength was reduced from 174 MPa to 71 MPa. magnesium alloy under the warm condition deformation mechanism for {1012} tensile twinning, {1011} compression and {0001} base a twin slip; tensile deformation along different angles, different mechanisms. Tensile direction and extrusion direction angle of less than 45 DEG when the extruded magnesium alloy exhibited ductile fracture micro aggregate; and as the angle increases, characterized by ductile brittle mixed fracture, the angle is 67.5 degrees, the cleavage fracture of magnesium alloy square.

【作者单位】：昆明理工大学材料科学与工程学院;中国科学院金属研究所;
【基金】：国家自然科学基金项目(51305188) 华中科技大学材料成形与模具技术国家重点实验室开放课题研究基金(P2015-12)~~
【分类号】：TG146.22;TG379
【正文快照】： 镁合金具有低密度、高强度、电磁屏蔽效果优良及易回收等优点,常被作为轻量化结构材料应用于汽车、交通、电子等行业[1-2]。然而,镁合金为密排六方金属结构,在室温下滑移系较少,塑性较差,导致加工困难。镁合金常见的滑移系有[3]:{0001}?0211?基面?a?滑移,}0110{?0211?柱面?a?

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