热力学模拟优化高强耐蚀7150合金成分  

Thermodynamic Simulation Optimization of High Strength and Corrosion Resistance 7150 Alloy Composition

作　　者：晁代义 孙有政[1] 赵巍 姜浩 吕正风[1] 程仁策 CHAO Daiyi;SUN Youzheng;ZHAO Wei;JIANG Hao;LV Zhengfeng;CHENG Rence(Shandong Nanshan Aluminum Co.,Ltd.,Longkou 265713,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150006,China)

机构地区：[1]山东南山铝业股份有限公司,山东龙口265713 [2]哈尔滨工业大学材料科学与工程学院,哈尔滨150006

出　　处：《有色金属工程》2020年第2期36-40,共5页Nonferrous Metals Engineering

摘　　要：探讨了7150铝合金的凝固路径并研究了传统7150合金中主合金元素配比对MgZn2、Al2CuMg的生成温度及数量的变化规律。在满足耐蚀性的基础上,当主合金元素Zn含量在6.4%,Mg含量在2.4%,Cu含量在2.3%时,合金中非平衡凝固相MgZn2含量高于4.55%,而Al2CuMg相含量低于0.9%,既实现强化效果,又能够提高抗腐蚀性能。采用扫描电镜和热分析手段研究优化后的实验合金Al-6.4Zn-2.4Mg-2.3Cu结果与计算值基本保持一致。从实验合金的TTT和CCT曲线可以看出该合金的GP区、η′和η相鼻尖温度分别为140~160、320~340和360~380℃,其临界冷却速率不得低于20.2℃/s。The solidification path of 7150 alloy and the effect of main alloys elements variations rule of MgZn2 and Al2 CuMg generation temperature and quantity in 7150 alloy were studied.On the basis of satisfying corrosion resistance,when the main alloying element Zn content is 6.4%,Mg content is 2.4%,and Cu content is 2.3%,the non-equilibrium solidified phase MgZn2 content in the alloy is higher than 4.55%;while the content of Al2 CuMg is lower than 0.9%,which not only meets the strengthening effect,but also improves the corrosion resistance.The optimized experimental alloy Al-6.4 Zn-2.4 Mg-2.3 Cu alloy was studied by scanning electron microscopy and thermal analysis and these results are basically consistent with the calculated values.From the TTT and CCT curves of the experimental alloy,it can be seen that the GP region,η′andηphase nose tip temperatures of the alloy are 140-160℃,320-340℃ and 360-380℃,respectively;the critical cooling rate must be higer than 20.2℃/s.

关 键 词：7150合金 模拟优化 鼻尖温度 临界冷却速率 

分 类 号：TG146.21[一般工业技术—材料科学与工程]