In situ XRD study on the phase transformations of the gas-atomized Ti-22Al-25Nb powder

被引：8
作者：
Yang, Longchuan [1 ]
Wang, Maosong [1 ]
Liu, Binglin [1 ]
Du, Yulei [1 ]
Liao, Wenhe [1 ]
机构：
[1] Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Peoples R China
来源：
MATERIALS LETTERS | 2020年 / 277卷
基金：
中国国家自然科学基金;
关键词：
Intermetallic alloys and compounds; Phase transformation; Powder technology; Microstructure; Ti-22Al-25Nb; Gas-atomized alloy powders; B2; GRAIN-GROWTH; MICROSTRUCTURAL EVOLUTION; ORTHORHOMBIC PHASE; TENSILE BEHAVIOR; ALLOY;
D O I：
10.1016/j.matlet.2020.128378
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this paper, the phase transformations in the as-atomized Ti-22Al-25Nb powder were investigated by using in situ x-ray diffraction and differential scanning calorimetry. It was found that the as-atomized Ti-22Al-25Nb powder consists of metastable beta phase at room temperature. The beta phase is stable up to 550 degrees C. Then, the O phase precipitates from the beta phase matrix in the temperature range of 550 to 650 degrees C. The transition from O phase to alpha(2) phase occurs from 850 to 1050 degrees C. With further increasing temperature, the alpha(2) to B2 phase transition takes place. The present work is valuable for designing and optimizing processing and annealing parameters of Ti-22Al-25Nb alloy parts fabricated from powders. (C) 2020 Elsevier B.V. All rights reserved.
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页数：4
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