升温速率对轧制态7085铝合金组织与性能的影响  

Effect of heating rate on microstructure and properties of rolled 7085 aluminum alloy

作　　者：刘文义[1] LIU Wen-yi(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,China)

机构地区：[1]陕西理工大学材料科学与工程学院,陕西汉中723000

出　　处：《材料热处理学报》2022年第8期62-68,共7页Transactions of Materials and Heat Treatment

基　　金：陕西省科技计划一般项目-工业领域(2021GY-222);陕西省教育厅专项科学研究计划项目(18JK0158)。

摘　　要：利用Gleeble-3500型热模拟机对轧制态7085铝合金以不同升温速率进行加热处理,采用光学显微镜、X射线衍射仪和维氏硬度计等,研究了升温速率对合金显微组织和硬度的影响。结果表明:轧制态7085铝合金主要由α-Al基体和MgZn_(2)相组成;以0.5~10℃/s的升温速率加热到300℃时,基体组织发生回复,MgZn_(2)_(2)相未有明显变化;以0.5℃/s和1℃/s的升温速率加热到450℃时,基体组织发生再结晶,MgZn_(2)相逐渐溶入α-Al基体,合金硬度随着加热温度的升高逐渐增大;以5℃/s和10℃/s的升温速率加热到450℃时,回复组织和再结晶组织共存,MgZn_(2)相未完全溶入α-Al基体,合金硬度随着加热温度的升高先减小再增大。Rolled 7085 aluminum alloy was heated at different heating rates by Gleeble-3500 thermal simulator.The effect of heating rate on microstructure and hardness of the alloy was studied by means of optical microscope,X-ray diffractometer and Vickers hardness tester.The results show that the rolled 7085 aluminum alloy is mainly composed ofα-Al matrix and MgZn_(2) phase.When heated to 300℃at the heating rate of 0.5-10℃/s,the matrix microstructure recovers and the MgZn_(2) phase does not change significantly.When heated to 450℃at the heating rates of 0.5℃/s and 1℃/s,the matrix microstructure recrystallizes and the MgZn_(2) phase gradually dissolves into theα-Al matrix,and the hardness of the alloy increases gradually with the increase of heating temperature.The recovery microstructure and recrystallization microstructure coexist in the alloy and the MgZn_(2) phase is not completely dissolved into theα-Al matrix when the alloy is heated to 450℃with heating rates of 5℃/s and 10℃/s,and the hardness of the alloy first increases and then decreases with the increase of the heating temperature.

关 键 词：7085铝合金 升温速率 组织 性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]