7175铝合金铸锭均匀化工艺及组织分析  

Homogenization Process and Microstructure Analysis of 7175 Aluminum Alloy Ingot

作　　者：张宇 冯艳飞 杨路 吴楠 于长富 ZHANG Yu;FENG Yan-fei;YANG Lu;WU Nan;YU Chang-fu(Liaoning Zhongwang Group Co.,Ltd.,Liaoyang Liaoning 111003,China)

机构地区：[1]辽宁忠旺集团有限公司,辽宁辽阳111003

出　　处：《热处理技术与装备》2020年第1期41-45,共5页Heat Treatment Technology and Equipment

摘　　要：采用DTA热分析仪、光学显微镜和扫描电镜(SEM)等分析仪器,研究了7175铝合金铸锭组织及均匀化工艺。结果表明,7175合金的铸态凝固组织由α(Al)+S相+T相非平衡共晶相组成;当均匀化温度在440℃时,合金中枝晶组织部分消失,低熔点相溶解不充分,当均匀化温度在460℃时出现过热组织。调整为阶段均匀化440℃×12 h+460℃×8 h处理后,合金晶界处的共晶组织基本消除,第二相尺寸降低至30μm以下,含铜相基本全部回溶,均匀化效果良好。The microstructure and homogenization processes of 7175 aluminum alloy ingot are studied by means of DTA thermal analyser,optical microscope and scanning electron microscopy(SEM)etc.The results show that the as-cast solidification structure of 7175 alloy is composed of non-equilibrium eutectic phases ofα(Al)+S phase+T phase.The dendritic structure disappears partly as the homogenization temperature 440℃,the low melting point phase does not dissolve adequately,and the overheated structure appears at 460℃.The eutectic structure at the grain boundary of the alloy is basically eliminated after adjusting to stage homogenization processes of 440℃×12 h+460℃×8 h,the size of second phase is reduced to less than 30μm,and the cupric phase is almost completely redissolved which the homogenization effect is good.

关 键 词：7175铝合金 均匀化 显微组织 

分 类 号：TG156.25[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]