7050铝合金板在固溶过程中微结构与织构的演变

Evolutions of microstructures and textures of 7050 Al alloy plate during solution heat treatment

采用光学金相(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和织构材料(ODF)分析等研究7050铝合金热轧板在逐级升温固溶过程中微结构与织构的演变。结果表明:在固溶温度不超过490℃的条件下,板材中长条形再结晶晶粒平行于轧向分布,固溶板材与热轧板材的织构组态相似,均含有少量{001}<100>织构,晶粒取向主要聚集在β-取向线和α-取向线上;具有{124}<211>和{112}<111>取向的形变长条形组织由于回复和连续再结晶使其取向逐渐趋同,取向密度增强;最后经(475℃,12h)处理的样品中残留有Al2CuMg和Al7Cu2Fe相;而经(490℃,4h)处理的样品中,Al2CuMg相全部溶入基体,Al7Cu2Fe相仍然存在。

Evolutions of microstructures and textures of 7050 Al alloy hot rolled plate during solution heat treatment were studied by OM,SEM,TEM,XRD and ODF techniques.The results show that when the samples are heated stage by stage up to 490 ℃,the lamellar grains are still parallel to the rolling direction.The textures of the solution treated samples are similar to the rolled ones.The grain orientations mainly concentrate to β-fiber and α-fiber,in company with a little {001}〈100〉 texture.The orientations densities of {124}〈211〉 and {112}〈111〉 textures increase with the recovery and continuous recrystallization of the deformed lamellar matrix.The sample,which is held at 475 ℃ for 12 h in the last stage during the solution,contains Al2CuMg and Al7Cu2Fe particles.The sample,which is held at 490 ℃ for 4 h in the last stage during the solution,still includes Al7Cu2Fe particles,but excludes Al2CuMg particles.