摘要
采用CALPHAD技术及热力学计算软件模拟7055合金的凝固路径、TTT曲线,以及η(MgZn_(2))相和S(CuMgAl_(2))相生成温度和生成数量随Zn、Mg、Cu含量变化的关系曲线,并进行DTA曲线测试,测试结果与热力学结果相一致。热力学计算结果表明,随Zn、Mg、Cu元素含量增加,液相线温度降低,低熔点共晶相析出温度升高;凝固组织中η相(MgZn_(2))的生成温度在408~448℃范围内,生成量为5.7%~6.9%;S相(CuMgAl_(2))的生成温度在436~469℃之间,生成量为0.5%~1.9%;随着Mg含量增加,合金的淬火敏感性提高,Zn、Cu元素含量的变化对合金的淬火敏感性影响不大。
The solidification path and TTT curve of 7055 alloy were simulated by CALPHAD technology and thermodynamic calculation software.The relationship curve between the formation temperature and the amount ofη(MgZn_(2))phase and S(CuMgAl_(2))phase with the changes of Zn,Mg and Cu contents was simulated.The DTA curve test was performed and the test results were consistent with the thermodynamic results.The thermodynamic calculation results show that the liquidus temperature decreases and the precipitation temperature of the low melting eutectic phase increases with increasing content of Zn,Mg and Cu.The formation temperature ofηphase(MgZn_(2))in the solidified structure is in the range of 408℃to 448℃,and the amount of formation is 5.7%to 6.9%.The formation temperature of the S phase(CuMgAl_(2))is between 436℃and 469℃,and the amount of formation is 0.5%to 1.9%.With increasing of Mg content,the quenching sensitivity of the alloy increases,and the change of Zn and Cu content has little effect on the quenching sensitivity of the alloy.
作者
吴楠
杨路
郑健
于长富
张祝珲
WU Nan;YANG Lu;ZHENG Jian;YU Chang-fu;ZHANG Zhu-hui(Liaoning Zhongwang Group Co.,Ltd.,Liaoyang Liaoning 111003,China)
出处
《热处理技术与装备》
2021年第3期23-27,共5页
Heat Treatment Technology and Equipment
关键词
7055合金
热力学计算
相组成
淬火敏感性
7055 alloy
thermodynamic calculation
phase composition
quenching sensitivity
