Kinetics of the ω phase transformation of Ti-7333 titanium alloy during continuous heating

被引：35
作者：
Hui, Qiong [1 ]
Xue, Xiangyi [1 ]
Kou, Hongchao [1 ]
Lai, Minjie [1 ]
Tang, Bin [1 ]
Li, Jinshan [1 ]
机构：
[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
来源：
JOURNAL OF MATERIALS SCIENCE | 2013年 / 48卷 / 05期
关键词：
CRYSTALLIZATION; PRECIPITATION; ALPHA; PARTICLES; NUCLEATION; BEHAVIOR; GROWTH; FE;
D O I：
10.1007/s10853-012-6962-5
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Dilatometry method was used to study the omega phase transformation kinetics of a near-beta titanium alloy Ti-7Mo-3Cr-3Nb-3Al during continuous heating. The local activation energy as a function of transformed volume fraction f (omega) was determined by Kissinger-Akahira-Sunose (KAS) method, which increases with the transformation proceeding and the average value is about 85.06 kJ/mol. The nucleation and growth mechanism of the omega phase was investigated by the non-isothermal local Avrami exponent n, which appears a significant change with the transformed volume fraction, indicating that the transformation mechanism varies at different stages. The local Avrami exponent lies between 0.5 and 2 in a wide transformed volume fraction range of 0.05-0.9, indicating that the dominating mechanism of omega phase transformation in Ti-7333 titanium alloy is the three-dimensional growth with a near-zero nucleation rate.
引用
收藏
页码：1966 / 1972
页数：7
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