Al-Cu合金热裂倾向性评价  

Evaluation of hot cracking tendency of Al-Cu alloy

作　　者：马栋雷 张显飞[1] 赵忠兴[1] 刘道昕 冯志军 李宇飞 MA Donglei;ZHANG Xianfei;ZHAO Zhongxing;LIU Daoxin;FENG Zhijun;LI Yufei(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110159,Liaoning China;Key Laboratory of Automotive Materials,Ministry of Education,Changchun 130022,Jilin China;School of Materials Science and Engineering,Jilin University,Jilin 130000,Changchun China;Shenyang Foundry Research Institute Co.,Ltd.,Shenyang 110000,Liaoning China)

机构地区：[1]沈阳理工大学材料科学与工程学院,辽宁沈阳110159 [2]汽车材料教育部重点实验室,吉林长春130022 [3]吉林大学材料科学与工程学院,吉林长春130000 [4]沈阳铸造研究所有限公司,辽宁沈阳110000

出　　处：《中国铸造装备与技术》2023年第1期34-42,共9页China Foundry Machinery & Technology

基　　金：辽宁省自然科学基金(2020-KF-14-04);高端装备轻合金铸造技术国家重点实验室开放基金(LACT-010)。

摘　　要：本文采用树脂砂型,开展了Al-Cu合金热裂倾向性试验,分析了试样热节处金相组织、热裂纹萌生时的温度和收缩力变化。结果表明,Cu含量小于5wt.%时,随着Cu含量升高,平均晶粒尺寸减小,靠晶界处析出呈连续网状分布的θ相增多,热裂倾向性减小。随Cu含量升高,热裂纹初始萌生温度降低,裂纹萌生时的固相体积分数先升高后降低。提出用热裂纹初次萌生时的温度减去完全凝固时的温度与合金结晶温度区间的比值判定Al-Cu合金热裂倾向性。该值越小,合金的热裂倾向性越小。The hot cracking tendency experiment of Al-Cu alloy has been carried out in the text by use of resin sand mold. The metallographic structure at the hot spot of the sample, the changes of temperature and shrinkage force at the time of hot crack initiation have been analyzed. The results show that when the Cu content is less than 5%, with the increase of Cu content, the average grain size decreases,the precipitation near the grain boundary presents continuous network distribution θ phase increases,and the hot cracking tendency decreases. With the increase of Cu content, the initial temperature of hot crack initiation decreases, and the solid volume fraction at crack initiation first increases and then decreases. It is proposed that the ratio of the temperature at the initial initiation of hot cracks minus the temperature at the time of complete solidification to the alloy crystallization temperature range has been used to determine the hot cracking tendency of Al Cu alloys. The smaller the value is, the smaller the hot cracking tendency of the alloy is.

关 键 词：AL-CU合金 Al2Cu相 热裂倾向性 评价指标 

分 类 号：TG290[金属学及工艺—铸造] TG146.2[一般工业技术—材料科学与工程]