Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2010-02-15

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

Included Journals: Scopus、EI、SCIE

Volume: 527

Issue: 4-5

Page Number: 1003-1007

ISSN: 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.