热处理对LF6合金晶间腐蚀性能的影响  

Effect of Heat Treatment on Intergranular CorrosionProperties of LF6 Alloy

作　　者：张春旭 李延军 刘学 刘欢 ZHANG Chun-xu;LI Yan-jun;LIU Xue;LIU Huan(Liaoning Zhongwang Group Co.,Ltd.,Liaoyang 111003,China)

机构地区：[1]辽宁忠旺集团有限公司,辽阳111003

出　　处：《铝加工》2020年第6期21-23,共3页Aluminium Fabrication

摘　　要：LF6合金挤压型材进行(80~440)℃×4 h的稳定化处理后,根据标准ASTM G67中硝酸质量损失法对其晶间腐蚀性能进行对比分析。结果发现LF6合金的晶间腐蚀敏感性在80℃后随温度提高而提高;在240℃时,合金晶间腐蚀敏感性达到最高;温度提高至380℃时,晶间腐蚀敏感性达到较低水平。通过扫描电镜对比分析,发现不同热处理制度下LF6中的β相在晶界析出形式不同,即当热处理温度为240℃时,大量β相在晶界处连续分布;当温度升高至380℃后,β相的分布相对均匀但不连续。The LF6 alloy extruded profile was stabilized with system of(80~440)℃×4 h.The intergranular corrosion performance was compared and analyzed according to Nitric acid mass loss method of ASTM G67.It was found that the intergranular corrosion sen⁃sitivity of LF6 alloy increases with temperature after 80℃;the intergranular corrosion sensitivity of the alloy is highest at 240℃;when the temperature is raised to 380℃,the intergranular corrosion sensitivity is lower.It was found that theβphase in LF6 has dif⁃ferent precipitation forms at the grain boundary under different heat treatment regimes by aid of scanning electron microscopy.A large number ofβphases are continuously distributed at the grain boundary when the heat treatment temperature is 240℃.The distribu⁃tion ofβphase is relatively uniform but not continuous when the temperature rises to 380℃.

关 键 词：LF6铝合金 挤压型材 热处理 晶间腐蚀 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]