Effects of initial microstructure on the aging behavior and subsequent mechanical properties of Ti–Nb–O titanium alloy
Effects of initial microstructure on the aging behavior and subsequent mechanical properties of Ti–Nb–O titanium alloy
复制标题
初始显微组织对Ti-Nb-O钛合金时效行为及后续力学性能的影响
DOI：
10.1557/s43578-022-00631-0
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发表时间：
2022
影响因子：
2.7
通讯作者：
Chao
中科院分区：
文献类型：
--
作者：
Junshuai Wang;W. Xiao;Yu Fu;Lei Ren;Bo Song;Cuiyun Liu;Chao
对亚稳态β型ti - 38nb - 0.2合金进行了冷轧（CR）和固溶处理（ST），研究了初始组织对时效行为和后续力学性能的影响。CR引入了高密度位错和晶粒细化，抑制了ω相的形成，促进了α相的形成。在573 K时效后，CR试样由α + β相和高密度位错组成，而ST试样则呈现出均匀的ω相析出。在773 K时效后，CR试样表现为超细等轴α相，无明显的β晶界；ST试样中针状α相不均匀分布于晶内和晶界，晶界附近无析出区。不同的初始组织导致不同龄期试样的强度和杨氏模量差异较大。
Metastable β-type Ti–38Nb–0.2O alloy was subjected to cold rolling (CR) and solution treatment (ST), and the effects of initial microstructure on the aging behavior and subsequent mechanical properties were investigated. High density of dislocations and grain refinement were introduced by CR, which suppressed the ω phase and promoted the α phase in the subsequent aging process. Upon aging at 573 K, the CR specimen consisted of α + β phase and high density of dislocations, while the ST specimen showed homogeneous precipitation of ω phase. Upon aging at 773 K, the CR specimen exhibited ultrafine equiaxed α phase without obvious β grain boundary, while the ST specimen contained acicular α precipitates nonuniformly distributed in the internal grain and grain boundary, and precipitate-free zone near grain boundaries were observed. The different initial microstructures led to large difference in strength and Young’s modulus between the aged specimens.