Hits:

Indexed by:期刊论文

Date of Publication:2010-02-15

Journal:MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Included Journals:SCIE、EI、Scopus

Volume:527

Issue:4-5

Page Number:1003-1007

ISSN No.:0921-5093

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

Abstract: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.