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金属学报  2010, Vol. 46 Issue (5): 575-580    DOI: 10.3724/SP.J.1037.2009.00708
  论文 本期目录 | 过刊浏览 |
Mg-Zn合金时效过程中GP区析出的热力学分析
王晓亮1); 李长荣1);  郭翠萍1);  杜振民1);  何维2)
1) 北京科技大学材料科学与工程学院; 北京 100083 2) 广西大学材料科学与工程学院; 南宁 530004
PRECIPITATION BEHAVIOR OF GP ZONES DURING AGEING PROCESS OF Mg-Zn ALLOY
WANG Xiaoliang1);  LI Changrong1);  GUO Cuiping1);  DU Zhenmin1);  HE Wei2)
1) School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083 2) School of Materials Science and Engineering; University of Guangxi; Nanning 530004
引用本文:

王晓亮 李长荣 郭翠萍 杜振民 何维. Mg-Zn合金时效过程中GP区析出的热力学分析[J]. 金属学报, 2010, 46(5): 575-580.
, , , , . PRECIPITATION BEHAVIOR OF GP ZONES DURING AGEING PROCESS OF Mg-Zn ALLOY[J]. Acta Metall Sin, 2010, 46(5): 575-580.

全文: PDF(822 KB)  
摘要: 

利用显微硬度、XRD及TEM分析了Mg-1.9Zn (原子分数, %)二元合金时效硬化现象及GP区的形态和出现的温度范围. 研究结果表明: 在343和383 K时效过程中, 过饱和固溶体中发生Zn原子偏聚, 形成形态不同的GP区; 在423 K时效, 硬化峰值出现较早, 没有典型GP区出现. 利用本文优化获取的镁基固溶体相的热力学参数, 给出镁基过饱和固溶体存在亚稳态溶解度间隙和溶质原子偏聚GP区时Gibbs自由能曲线的特征形式, 确定了具有GP区析出效应的Mg-Zn体系的合金成分范围和时效温度区间.

关键词 Mg-Zn合金低温时效GP区热力学分析    
Abstract

The age--hardening behavior of the Mg-1.9Zn (atomic fraction, %) alloy, morphologies of GP zones and temperature range of GP zone precipitation in the alloy were investigated by micro-hardness, XRD and TEM. The results show that the Zn atoms segregation occurs in the super-saturated solid solution, forming GP zones with different shapes during ageing process at 343 and 383 K; while at 423 K the age-hardening peak occurs earlier but no typical GP zone appeared. Using the thermodynamic parameters of the Mg-Zn system, the Gibbs free energy relations of the Mg-based solid solution phase were calculated, indicating the existences of the metastable miscibility gap and the solute atoms segregation in the super-saturated solid solution. With the reported data and the present experimental results, the ranges of composition and aging temperature for GP zone precipitation in the Mg-Zn alloy were determined.

Key wordsMg-Zn alloy    low temperature ageing    GP zone    thermodynamic analysis
收稿日期: 2009-10-26     
基金资助:

国家自然科学基金项目50731002和50671009以及高等学校博士学科点专项基金项目20060008015资助

作者简介: 王晓亮, 男, 1984年生, 硕士生

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