In-situ neutron diffraction study of phase stability and equilibria in the Ti-rich part of the Ti-Al binary system

被引：9
|
作者：
Xu, Shuai [1 ,4 ]
Reid, Mark [2 ]
Liss, Klaus-Dieter [2 ,4 ,5 ]
Xu, Yong [3 ]
Zhang, Heng [1 ]
He, Jianping [1 ]
Lin, Junpin [1 ]
机构：
[1] Univ Sci & Technol Beijing, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
[2] Australian Nucl Sci & Technol Org, Lucas Heights, NSW 2234, Australia
[3] Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Shandong, Peoples R China
[4] Guangdong Technion Israel Inst Technol, Mat & Engn Sci Program, Shantou 515063, Guangdong, Peoples R China
[5] Technion Israel Inst Technol, IL-32000 Haifa, Israel
来源：
INTERMETALLICS | 2020年 / 120卷
基金：
中国国家自然科学基金;
关键词：
Titanium aluminides; In-situ neutron diffraction; Phase transformation; Order-disorder transformation; Phase diagram; NB;
D O I：
10.1016/j.intermet.2020.106761
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Three alloys with composition range of Ti-(25-35)Al (atomic %) were in-situ investigated using neutron diffraction to clarify the phase stability and equilibria in the Ti-rich part of the Ti-Al binary system. The phase transformation sequences of these three alloys were identified based on the neutron diffraction results and differential scanning calorimetry. No superstructure diffraction of beta(o) has been found in the neutron diffraction patterns. It is concluded that the beta(o) phase in the examined composition range is thermodynamically unstable. Based on the phase transformation sequences of these three alloys, combining the characters of congruent type relationship and peritectoid type relationship, the phase equilibria among beta, alpha and alpha(2) phases were confirmed as a peritectoid type, with two peritectoid reactions, i.e., beta-alpha ->alpha(2) and beta +alpha(2)->alpha.
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页数：9
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