Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 12    December 2010

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Microstructure and mechanical properties of
new metastable β type titanium alloy
ZHOU Zhong-bo(周中波)1, FEI Yue(费 跃)1, LAI Min-jie(赖敏杰)1, KOU Hong-chao(寇宏超)1,
CHANG Hui(常 辉)1, SHANG Guo-qiang(商国强)2

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, China

Abstract:A new metastable β type titanium alloy called TB-13 with the combination of excellent strength and ductility was developed successfully. In order to develop a perspective on this new alloy, the influence of several commonly used heat treatments on the microstructure and properties was studied. In solution-treated and quenched samples, a low-temperature aging at 480 °C results in the precipitation of finer α phase. The precipitation of coarser α phase plate at higher aging temperature (560 °C) leads to the increase of tensile ductility but reduction of strength. During low-temperature aging at 300 °C, quite homogeneous distribution of fine isothermal ω phase particles was found. The isothermal ω phase provides nucleation sites for α phase during two-step aging process and makes α phase extremely fine and disperse uniformly in b matrix. Thus, TB-13 alloy is strengthened and its mechanical properties are improved.

 

Key words: metastable β titanium; heat treatment; microstructure; mechanical property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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