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论文类型：期刊论文

发表时间：2010-02-15

发表刊物：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录刊物：SCIE、EI、Scopus

卷号：527

期号：4-5

页面范围：1003-1007

ISSN号：0921-5093

关键字：Titanium alloys; Compression test; Twinning; X-ray diffraction (XRD); Stress-induced martensitic transformation (SIM)

摘要：The effect of hydrogen on the cold deformation behaviors of the Ti-6Al-4V alloys (alpha + beta-type) has been investigated. By quenching from the beta transition temperature a metastable microstructure is obtained. A pronounced influence of the addition of hydrogen on the deformation behaviors is found. Microstructures exhibiting large alpha '' martensites and metastable beta phase show a better plasticity than that of the as-received alloy. It is shown that the cold deformation is controlled by the deformation twins and stress-induced martensitic transformation. The deformation twins appear inside the alpha '' martensite in specimens containing lower than 0.45 wt.% H, which promotes the deformation. When the hydrogen concentration is further increased up to 0.9wt.%, the metastable beta phases transform to alpha '' martensites during the deformation, which, together with the deformation twins. increase the true strain from 30% to 60%. (C) 2009 Elsevier B.V. All rights reserved.