Published November 2019 | Version v1
Journal article Metadata-only

Grain refinement mechanism of Ti-55 titanium alloy by hydrogenation and dehydrogenation treatment

Creators

  • 1. Department of Plasticity Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200030 (China)
  • 2. Beijing Hangxing Machinery Co., Ltd., Beijing 100013 (China)

Description

Highlights: • Ultrafine-grained titanium alloy sheet is obtained by thermohydrogen treatment. -- Abstract: The average grain size of Ti-55 titanium alloy is refined by hydrogenation and dehydrogenation treatment from 5.96 μm to 0.5 μm. The refinement mechanism is discussed through microstructural observations. The main refining effects may derive from recrystallization and phase transformation. The micro-strain field in the matrix by the formed hydride during the hydrogenation process results in serious distortion and many dislocations. The recrystallization nucleation and growth during the dehydrogenation process are promoted. Additionally, the eutectoid transformation of βH → δ + α during hydrogenation process and the hydride decomposition of δ → α + H2↑ as well as the hydrogen release in the form of solid solution transformation of αH → α + H2↑ and βH → α + β + H2↑ during dehydrogenation stage break the matrix structure into smaller microstructure.

Additional details

Identifiers

DOI
10.1016/j.matchar.2019.109919;
PII
S1044580319312744;

Publishing Information

Journal Title
Materials Characterization
Journal Volume
157
Journal Page Range
vp.
ISSN
1044-5803
CODEN
MACHEX

INIS

Country of Publication
United States
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
55031203
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
DECOMPOSITION; DEHYDROGENATION; DISLOCATIONS; EUTECTOIDS; GRAIN REFINEMENT; GRAIN SIZE; HYDRIDES; HYDROGEN; HYDROGENATION; MATRICES; NUCLEATION; PHASE TRANSFORMATIONS; RECRYSTALLIZATION; REFINING; SOLID SOLUTIONS; TITANIUM 55; TITANIUM ALLOYS
Descriptors DEC
ALLOYS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHEMICAL REACTIONS; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DISPERSIONS; ELEMENTS; EVEN-ODD NUCLEI; HOMOGENEOUS MIXTURES; HYDROGEN COMPOUNDS; INTERMEDIATE MASS NUCLEI; ISOTOPES; LINE DEFECTS; MICROSTRUCTURE; MIXTURES; NONMETALS; NUCLEI; PROCESSING; RADIOISOTOPES; SIZE; SOLUTIONS; TITANIUM ISOTOPES; TRANSITION ELEMENT ALLOYS

Optional Information

Copyright
Copyright (c) 2019 Elsevier Inc. All rights reserved.