Non-isothermal phase transformation kinetics of ω phase in TB-13 titanium alloys

被引：33
|
作者：
Zhou, Zhongbo [1 ]
Lai, Minjie [1 ]
Tang, Bin [1 ]
Kou, Hongchao [1 ]
Chang, Hui [1 ]
Zhu, Zhishou [2 ]
Li, Jinshan [1 ]
Zhou, Lian [1 ]
机构：
[1] NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
[2] Beijing Inst Aeronaut Mat, Beijing 100095, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 20期
关键词：
Phase transformation; Kinetics; Non-isothermal; omega Phase; Titanium alloy; RESOLUTION ELECTRON-MICROSCOPY; CRYSTALLIZATION KINETICS; AVRAMI EXPONENT; METALLIC-GLASS; PRECIPITATION; PARTICLES; BEHAVIOR; MODELS; BULK; FE;
D O I：
10.1016/j.msea.2010.03.064
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The omega phase transformation kinetics of TB-13 titanium alloy has been analyzed by non-isothermal dilatometry. The average value of local activation energy determined is about 91.7 kJ/mol. The nucleation and growth mechanism of the omega phase has been investigated by the non-isothermal local Avrami exponent. Both the local Avrami exponent and the local activation energy during the omega phase transformation process change significantly with the transformed volume fraction, indicating that the omega phase transformation mechanism in this alloy varies at different stages. The local Avrami exponent lies between 1 and 2 in a wide transformed volume fraction range of 0.17-0.95, indicating that the dominating mechanism of omega phase transformation in TB-13 titanium alloy is the three-dimensional growth with a near-zero nucleation rate. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：5100 / 5104
页数：5
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