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有色金属工程:2020,(2):36-40
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热力学模拟优化高强耐蚀7150合金成分
晁代义1, 孙有政1, 赵巍1, 甄良2, 吕正风1, 程仁策1
(1.山东南山铝业股份有限公司;2.哈尔滨工业大学 材料科学与工程学院)
Thermodynamic simulation optimization of high strength and corrosion resistance 7150 alloy composition
Chao Daiyi1, Sun Youzheng1, Zhao Wei1, Zhen Liang2, Lv Zhengfeng1, Cheng Rence1
(1.Shandong Nanshan Aluminum Co,Ltd,Shandong Longkou;2.School of Materials Science and Engineering,Harbin institute of technology,Hei Longjiang Harbin)
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投稿时间:2019-04-19    修订日期:2019-06-03
中文摘要: 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%,既满足强化效果,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合金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。
Abstract:The solidification path of 7150 alloy and the effect of main alloys elements variations rule of MgZn2 and Al2CuMg 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 Al2CuMg is lower than 0.9%, which not only meets the strengthening effect, but also improves the corrosion resistance. The optimized experimental alloy Al-6.4Zn-2.4Mg-2.3Cu alloy was studied by scanning electron microscopy and thermal analysis and thehe 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′ and η phase 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.
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晁代义,孙有政,赵巍,甄良,吕正风,程仁策.热力学模拟优化高强耐蚀7150合金成分[J].有色金属工程,2020,(2):36-40.

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