Heterogeneous Microstructure Enhanced Comprehensive Mechanical Properties in Titanium Alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

3 Scopus Citations
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Author(s)

  • Mengyuan HAO
  • Yalong WANG
  • Pei LI
  • Jiaming ZHU
  • Dong WANG

Detail(s)

Original languageEnglish
Pages (from-to)3082–3091
Journal / PublicationJOM
Volume73
Issue number10
Online published16 Jul 2021
Publication statusPublished - Oct 2021

Abstract

The design of materials with good strength and ductility is still a challenge to current materials science. Here, we propose a two-step aging method to balance the comprehensive mechanical properties in near-β titanium alloys by designing multiscale α precipitate distribution. Phase-field calculations in Ti-V binary alloys are used to screen the heat treatment process by changing the microstructure. Our calculations show that the coarse α precipitates nucleate near grain boundaries at 650°C first and grow and nucleate to the grain interior with the increase of aging time. The fine α precipitates nucleate and grow in grain after subsequent aging at 550°C, and the whole system shows four different microstructures in grain by changing the aging time, i.e., homogeneous fine α precipitates, coarse α precipitates surrounded by fine α precipitates, fine α precipitates surrounded by coarse α precipitates, and homogeneous coarse α precipitates. Based on this strategy, we design a hierarchical α precipitate microstructure in Ti55531 alloy by two-step aging at 650°C/60 min plus 550°C/180 min, which shows enhanced mechanical properties with the ultimate tensile strength of 1.38 GPa and total elongation of 6%. Our work sheds light on the design of novel Ti alloys with comprehensive strength and ductility properties by heterogeneous microstructure.

Citation Format(s)

Heterogeneous Microstructure Enhanced Comprehensive Mechanical Properties in Titanium Alloys. / HAO, Mengyuan; WANG, Yalong; LI, Pei; ZHANG, Tianlong; ZHU, Jiaming; WANG, Dong.

In: JOM, Vol. 73, No. 10, 10.2021, p. 3082–3091.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review