Phase transformations and phase equilibria of a Ti-46.5Al-16.5Nb alloy

被引：16
作者：
Xu, Shuai [1 ]
Xu, Xiangjun [2 ]
Xu, Yong [1 ,3 ]
Liang, Yongfeng [1 ]
Lin, Junpin [1 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[2] Zhongyuan Univ Technol, Mat & Chem Sch, Zhengzhou 450007, Peoples R China
[3] Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Shandong, Peoples R China
来源：
MATERIALS & DESIGN | 2016年 / 101卷
基金：
中国国家自然科学基金;
关键词：
TiAl alloy; Phase equilibrium; CALPHAD; Phase transformation; Phase diagram; AL-NB SYSTEM; 1400-DEGREES-C ISOTHERMAL SECTION; TIAL ALLOYS; MICROSTRUCTURE;
D O I：
10.1016/j.matdes.2016.03.131
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The isothermal sections of the phase diagram and the liquid projection of the Ti-Al-Nb ternary system as well as the phase transformations of a Ti-46.5Al-16.5Nb alloy were calculated using Pandat software. The solidification sequence and subsequent phase transformations of the alloy were verified by microstructural observations and thermo-analysis (TA). The tie-triangle of the three-phase region of alpha + beta + gamma at 1300 degrees C and the tie line of the a and beta phases at 1400 degrees C were identified using electron probe microanalysis (EPMA). Neither the phase equilibria of the alpha, beta and. phases at 1300 degrees C nor the tie line of the a and beta phases at 1400 degrees C are in agreement with the calculated phase diagrams reported in the literature. The solidification sequence and subsequent solid-state phase transformations of this alloy were determined as follows: liquid -> liquid + beta -> beta -> alpha + beta -> alpha + beta + gamma -> beta + gamma (The beta phase and the B2 phase were not differentiated in the present paper.) The phase transformation temperatures were also measured by differential scanning calorimetry (DSC). (C) 2016 Elsevier Ltd. All rights reserved.
引用
收藏
页码：88 / 94
页数：7
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