挤压温度对AA7003铝合金组织性能的影响

Effect of Extrusion Temperature on Structure Properties of AA7003 Aluminium Alloy

采用力学拉伸、扫描电镜、电子背散射衍射和电化学腐蚀等测试分析方法,研究了不同挤压参数下7003铝合金的再结晶程度、织构和力学性能之间的关系。结果表明,挤压温度为450℃,挤压速度为1 mm/s时,合金的再结晶程度最大,而且再结晶程度升高使合金的力学性能下降。当挤压温度为470℃时,出现较强的再结晶立方织构{001}<100>,合金的抗拉强度和伸长率升高。因此可以得出结论,立方织构可以提高挤压态7003铝合金的抗拉强度和伸长率。

The relations among recrystallization, texture and mechanical properties of AA7003 alloy under different extrusion processes were investigated by means of mechanical tensile, SEM, EBSD and electrochemical corrosion test. The results showed that the recrystallization extent reached maximum under the extrusion process conditions of T=450 °C and v=1 mm/s, and the increase of recrystallization extent had a negative effect on the mechanical properties. Moreover, a relatively strong recrystallization cube orientation {001}<100>appeared when the extrusion temperature was 470 °C, which leads to a high tensile strength and elongation. Thus, it can be concluded that the cube texture is beneficial to the increase of tensile strength and elongation of extruded AA7003 alloy.