Mg-Zn合金时效过程中GP区析出的热力学分析
收稿日期: 2009-10-26
修回日期: 2010-03-10
网络出版日期: 2010-05-11
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
PRECIPITATION BEHAVIOR OF GP ZONES DURING AGEING PROCESS OF Mg-Zn ALLOY
Received date: 2009-10-26
Revised date: 2010-03-10
Online published: 2010-05-11
Supported by
Supported by National Natural Science Foundation of China (Nos.50731002 and 50671009) and Specialized Research Fund for the Doctoral Program of Higher Education (No.20060008015)
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 . DOI: 10.3724/SP.J.1037.2009.00708
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 words： Mg-Zn alloy; low temperature ageing; GP zone; thermodynamic analysis
[1] Yan F Y, Zhang Y H. Modern Manuf Technol Equipt, 2007; (4): 13
(阎峰云, 张玉海. 现代制造技术与装备, 2007; (4): 13)
[2] Zuo T Y. Adv Mater Ind, 2007; (12): 22
(左铁镛. 新材料产业, 2007; (12): 22)
[3] Shen K, Yin Z M, Wang T. Trans Nanjing Univ Aeronaut Astronaut, 2007; 24: 3
[4] Meissner K L. J Inst Met, 1927; 38 : 195
[5] Sturkey L, Clark J B. J Inst Met, 1959; 88: 177
[6] Murakami Y, Kawano O, Tamura H. Trans Jpn Inst Met,1971; 12: 323
[7] Mima G, Tanaka Y. J Jpn Inst Met, 1969; 33: 796
[8] Murakami Y, Kawano K, Tamura H. Mem Fac Eng, 1962; 23: 93
[9] Clark J B. Acta Metall, 1965; 13: 1281
[10] Buha J. Mater Sci Eng, 2008; A492: 11
[11] Agarwal R, Fries S G, Lukas H L. Z Metallkd, 1992; 83: 216
[12] Sundman B. Jansson B, Andersson J O. CALPHAD, 1985; 9: 153
[13] Kaptay G. Calphad, 2004; 28: 115
[14] Chen S L, Zhang F, Daniel S, Xie X F, Yan X Y, Chang Y A, Schmid–Fetzer R, Oates W A. JOM, 2003; 55(12): 48
[15] Clark J B, Zabdyr L, Moser Z. Phase Diagrams of Binary Magnesium Alloys, Metals Park, OH: ASM, 1988: 353
/
| 〈 |
|
〉 |
