Structure and mechanical properties of the annealed TZAV-30 alloy
Structure and mechanical properties of the annealed TZAV-30 alloy
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退火态TZAV-30合金的组织和力学性能
DOI：
10.1016/j.matdes.2014.02.017
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发表时间：
2014-06-01
影响因子：
8.4
通讯作者：
Liu, R. P.
中科院分区：
文献类型：
--
作者：
Liang, S. X.;Yin, L. X.;Liu, R. P.
Ti-30Zr-5Al-3V（wt.%，TZAV-30合金具有良好的力学性能，是一种很有潜力的航空航天结构材料。研究了ZTAV-30合金在不同退火热处理条件下的组织和力学性能。500 ~ 800 ℃退火的试样由α和β两相组成。在该温度范围内退火的样品中未检测到化合物。退火试样的显微组织特征为典型的篮状组织。在这些退火试样中测量了三个显微结构参数，板状α相的厚度，β相的相对分数和α晶粒的纵横比。当合金在500至800 ℃范围内退火时，板状α晶粒的平均厚度随着退火温度从500至700 ℃的增加而增加，但在800 ℃退火时减小。保留的β相的分数随着退火温度而增加。当退火温度高于700 ℃时，板状α晶粒的长径比先减小后增大。随着这三个组织参数的变化，合金的抗拉强度在1269 ~ 1355 MPa之间变化，屈服强度在1101 ~ 1190 MPa之间变化，延伸率在12.7%~ 8.4%之间变化。本文还对网篮组织TZAV-30合金的强韧化机理进行了探讨。皇冠版权所有（C）2014由爱思唯尔有限公司出版。保留所有权利。
The Ti-30Zr-5Al-3V (wt.%, TZAV-30) alloy having good mechanical properties is a potential structural material to apply in the aerospace industry. The microstructure and mechanical properties of ZTAV-30 alloy underwent various annealing heat treatments were investigated. The specimens annealed from 500 to 800 degrees C are composed of alpha and beta two phases. No compound is detected in specimens annealed in that temperature range. The microstructure of annealed specimens is characterized as a typical basket-weave microstructure. Three microstructural parameters, thickness of plate alpha phase, relative fraction of beta phase and aspect ratio of alpha grains, were measured in those annealed specimens. As the alloy annealed in the range from 500 to 800 degrees C, the average thickness of plate alpha grains increases with the increasing annealing temperature from 500 to 700 degrees C but decreases while annealed at 800 degrees C. The fraction of retained beta phase increases with annealing temperature. And the aspect ratio of plate alpha grains decreases firstly but increases while the annealing temperature is higher than 700 degrees C. As the variation of those three microstructural parameters, the strength of examined alloy varies from 1269 to 1355 MPa for tensile strength and from 1101 to 1190 MPa for yield strength, inversely, the elongation changes in the range from 12.7% to 8.4%. The strengthening and toughening mechanism of the TZAV-30 alloy with basket-weave microstructure is also discussed in this paper. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.