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挤压比对5154铝合金微结构、织构和力学性能的影响
英文标题:Influence of extrusion ratios on microstructure, texture and mechanical property of aluminum alloy 5154
作者:强华 张芝民 张文慧 周璐 
单位:重庆人文科技学院 西南大学 
关键词:5154铝合金 挤压比 电子背散射衍射技术 织构 力学性能 
分类号:TG146
出版年,卷(期):页码:2018,43(3):0-0
摘要:
利用扫描电镜(SEM)、电子背散射衍射技术(EBSD)、显微硬度和拉伸实验对经热挤压的5154铝合金进行了表征,研究了挤压工艺对合金的力学性能的影响。结果表明,不同挤压比的棒材的组织及性能有明显的差异。小挤压比试样的晶粒明显细化,择优排列形成平行于挤压方向(ED)的<111>丝织构,表现出优异的拉伸性能;大挤压比试样的晶粒尺寸和分布变得不均匀,EBSD结果显示,此时的挤压组织未出现织构。大挤压比试样内粗大的铸态组织容易发生不均匀变形,局部区域组织变形严重,发生二次再结晶,出现晶粒异常长大,其力学性能变差。
The heat-extruded aluminum alloys 5154 rods were characterized by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) techniques, microhardness and tensile tests, and the influence of extrusion process on the mechanical properties of the alloy was studied. The results show that the microstructure and performance of the bar under different extrusion ratios have obvious differences. The sample grains of small extrusion ratio are significantly refined, and the <111> silk texture is preferentially formed arrangement parallel along the extrusion direction (ED) . Therefore, excellent tensile properties are showed. But the size and distribution of the sample grains with large extrusion ratio become uneven, and EBSD results show that the extruded structure do not appear texture at this time. Furthermore, coarse as-cast structure in large extrusion ratio specimen prone to uneven deformation, severe local structure deformation, secondary recrystallization, abnormal grain growth, which lead to poor mechanical properties.
基金项目:
重庆市教委科学技术资助项目(KJ1501601)
作者简介:
强华(1976-),女,硕士,副教授 E-mail:qh20049@163.com
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