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Indexed by:期刊论文

Date of Publication:2009-05-12

Journal:JOURNAL OF ALLOYS AND COMPOUNDS

Included Journals:SCIE、EI、Scopus

Volume:476

Issue:1-2

Page Number:550-555

ISSN No.:0925-8388

Key Words:Metal; Phase transitions; Microstructure

Abstract:The influence of hydrogen on microstructure evolution, metastable phase transformation and deformation behaviors of Ti-6Al-4V alloys were studied. Optical microscopy (OM), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were utilized to study the phase composition and Ti-6Al-4V-H metastable phase transformation. Uniaxial compression test, tensile test and impact test were conducted to investigate the effect of hydrogen on the room temperature plasticity. A completely martensites microstructure, composed of alpha' and alpha '' martensites, was obtained in specimen with less than 0.45 wt. % H. And the amount of alpha '' increased with the increase of hydrogen concentration. Further increase in hydrogen concentration (above 0.45 wt.%) resulted in a decrease of the volume fraction of alpha '' and the formation of 0 phase. As a result, the deformation limit increased in compression test. However, the elongation decreased dramatically in tensile test. Compact test identified the decrease of plasticity was induced by hydrogen alloying. (C) 2008 Elsevier B.V. All rights reserved.