Improvement of mechanical properties in Ti alloys using heterogeneous elemental distribution

Satoshi Emura, Xiaohua Min, Seiichiro Ii, Kaneaki Tsuzaki, Koichi Tsuchiya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Most of practical titanium alloys contain some alloying elements such as Nb and Mo, which are prone to segregation. In this study, we have tried to change the distribution of these alloying elements in two types of titanium alloys through thermomechanical treatment. Ti-Al-Nb base inter-metallic alloy, Ti-25Al-14Nb-2Mo-1Fe (mol %), was hot-forged and bar-rolled at 1273K in the (B2+α2) two phase region. After the rolling, Nb and/or Mo-rich region forms swirly band structure. Due to the segregation of these β stabilizing elements, we can obtain heterogeneous distribution of α2 phase particles after the heat treatment at 1273K, Room temperature tensile elongation value was improved from nearly 0 to 6 %, which can be attributed to this heterogeneous distribution of α2 phase particles. We also applied similar thermomechanical treatment on corrosion resistant β-type Ti-12Mo (mass %) alloys, and obtained Mo-rich swirly band-like structures. This led to heterogeneous precipitation of ω phase after aging at temperatures lower than 723K due to the local variation in β phase stability. Room temperature tensile elongation value after aging at 523K for 3. 6ks was improved from 4% to 19% with tensile strength of around 1000MPa.

Original languageEnglish
Title of host publicationTi 2011 - Proceedings of the 12th World Conference on Titanium
Pages536-539
Number of pages4
Publication statusPublished - 2012
Externally publishedYes
Event12th World Conference on Titanium, Ti 2011 - Beijing, China
Duration: Jun 19 2011Jun 24 2011

Publication series

NameTi 2011 - Proceedings of the 12th World Conference on Titanium
Volume1

Other

Other12th World Conference on Titanium, Ti 2011
Country/TerritoryChina
CityBeijing
Period6/19/116/24/11

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites

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