金属学报  2010, Vol. 46 Issue (12): 1473-1480    DOI: 10.3724/SP.J.1037.2010.00216

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相场方法研究Al-Ag合金γ相周围溶质析出过程

高英俊1, 2, 3,罗志荣1, 2, 张少义1,黄创高1

1. 广西大学物理科学与工程技术学院, 南宁 530004 2. 广西大学工程防灾与结构安全重点实验室, 南宁 530004 3. 中国科学院国际材料物理中心, 沈阳 110016

PHASE–FIELD SIMULATION OF SOLUTE PRECIPITATIONS AROUND THE  γ PHASE IN Al–Ag ALLOY

GAO Yingjun 1,2,3, LUO Zhirong 1,2, ZHANG Shaoyi 1, HUANG Chuanggao 1

1. College of Physics Science and Engineering, Guangxi University, Nanning 530004 2. Key Laboratory of Disaster Prevention and Structural Safety, Guangxi University, Nanning 530004 3. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 110016

高英俊 罗志荣 张少义 黄创高. 相场方法研究Al-Ag合金γ相周围溶质析出过程[J]. 金属学报, 2010, 46(12): 1473-1480.
. PHASE–FIELD SIMULATION OF SOLUTE PRECIPITATIONS AROUND THE  γ PHASE IN Al–Ag ALLOY[J]. Acta Metall Sin, 2010, 46(12): 1473-1480.

摘要 参考文献 相关文章 Metrics 全文: PDF(4609 KB)   摘要: 针对Al-Ag合金溶质的Spinodal亚稳互溶隙曲线的特点, 考虑溶质场与析出相的相互作用,通过构造时效温度和溶质浓度相关联的局域相互作用自由能密度函数,  建立了低Ag溶质的Al-Ag合金析出过程的相场模型. 模拟了Ag溶质浓度分别为4.2%和22%的体系中溶质场的Spinodal分解和析出Guinier-Preston 区 (GPZ), 以及在析出相附近形成一种无沉淀区(PFZ)的演化过程. 模拟结果表明, 在析出相周围形成了 椭圆形的PFZ, 其宽度大约是棒宽度的2倍,而在远离PFZ的区域出现了由于Spinodal分解而形成的Ag溶质分布图案.经过足够长的时效时间, 溶质场析出GPZ. 当Ag溶质浓度较高时, 浓度场会在PFZ周围形成多条液滴状的平行流线环绕着的析出相. 模拟结果与实验观察结果很好地吻合. 关键词 ： Al-Ag合金,  Spinodal分解,  相场模拟,  析出相     Abstract：Interactions between different precipitation products during phase decomposition for different alloys have been observed. Spinodal decomposition and intragranular precipitation are the two well–know mechanisms for explaining phase decomposition, both of which interaction mechanisms have been investigated experimentally in recently. A local free energy density function depending on aging temperature and composition has been proposed to describe the interaction between the Ag solute field and γ precipitates in phase–field simulation of spinodal decomposition in Al–Ag alloy. The evolution of spinodal decomposition in Al–Ag alloy with 4.2%Ag and 22%Ag has been simulated by the phase–field method using this function to represent numerically the precipitated Guinier–Preston zones (GPZ) around a γ phase. The simulated results show that PFZ around a precipitated phase is an elliptical and its width is about two times the width of γ phase. In the region far from PFZ, a pattern of Ag solute field appears due to spinodal decomposition. When Ag–depleted zones are relatively far apart with each other, spinodal decomposition is strongly affected by them. The formation of PFZ resulting from spinodal decomposition has been initiated in the central region of the supersaturated α matrix before the modulation effect of Ag solute field at edge reachs here. It is found that two or three Ag–rich bands appear around the PFZ. During aging, Ag diffuses from not only the α matrix but also the edge of Ag–depleted zones, where an accumulation of Ag occurs. After long time aging, many droplet–like Ag solute bands are formed near PFZ around γ phase. These simulated results are in beter agreement with the experimental results. Key words： Al–Ag alloy    spinodal decomposition    phase–field simlation    precipitation 收稿日期: 2010-05-05      ZTFLH:  TG111.5   基金资助: 国家自然科学基金项目50661001和50061001, 广西自然科学基金项目0991026, 0832029和0639004资助 作者简介: 高英俊, 男, 1962年生, 教授, 博士 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 高英俊 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00216      或      https://www.ams.org.cn/CN/Y2010/V46/I12/1473 参考文献 [1] L. F. Mondolfo. 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