基于DSC分析的Al-7Si-1.5Cu-0.5Mg合金热处理工艺研究  

Study on Heat Treatment Process of Al-Si-Cu-Mg Alloy Based on DSC Analysis

作　　者：宋跃文 侯击波[1] 毛红奎[1] 刘洪斌 SONG Yuewen;HOU Jibo;MAO Hongkui;LIU Hongbin(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Shanxi Zhongbing Casting Co.,Ltd.,Datong 037006,China)

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]山西中兵铸造有限责任公司,山西大同037006

出　　处：《热加工工艺》2022年第8期139-142,145,共5页Hot Working Technology

基　　金：山西省重点研发计划国际科技合作项目(201903D421080);山西省面上青年基金项目(201801D221148);山西省高等学校科技创新项目(2020L0319)。

摘　　要：示差热(DSC)分析通常用于合金相变温度点的确定。针对Al-7Si-1.5Cu-0.5Mg合金,将DSC吸收峰面积与θ相(Al_(2)Cu)的数量相联系,并辅之以SEM+EDS对DSC分析结果进行检测。结果表明,500℃下固溶4 h后DSC吸收峰面积从铸态的0.6 J/g降低至0.1 J/g,且随着固溶时间的增加,吸收峰面积无明显变化,与扫描电镜下对θ相溶解检测结果一致。均说明了在500℃下保温4 h后Al_(2)Cu基本溶入基体中,达到了良好的固溶效果。证明了示差热(DSC)可用于检测相的固溶程度,亦证明其具有进一步应用于热处理工艺制定的可行性。The DSC analysis was usually used to determine the phase transition temperature of alloys.For the Al-Si-Cu-Mg alloys,the differential heating(DSC)absorption peak area was related to the number ofθphases(Al_(2)Cu),supplemented by SEM+EDS detecting the results of DSC analysis.The results show that the DSC absorption peak area decreases from 0.6 J/g in the as-cast state to 0.1J/g after solid solution at 500℃for 4 h.Moreover,with the increase of solid dissolution time,the absorption peak area does not change significantly,which is consistent with the detection results ofθphase(Al_(2)Cu)dissolution under scanning electron microscopy.All indicate that Al_(2)Cu basically dissolves into the matrix after being kept at 500℃for 4 h,achieving a good solid solution effect.It proves that DSC can be used to detect the degree of solid solution of the phase,and it has the feasibility of being furtherly applied to the formulation of heat treatment processes.

关 键 词：Al-7Si-1.5Cu-0.5Mg合金 示差热(DSC) 固溶处理 Al_(2)Cu相 

分 类 号：TG166.3[金属学及工艺—热处理]