Enhanced yielding strength of near-α Ti-Al-Zr-Sn high temperature alloys

M. Jayaprakash; D. H. Ping; Y. Yamabe-Mitarai

doi:10.1016/j.msea.2014.11.099

Enhanced yielding strength of near-α Ti-Al-Zr-Sn high temperature alloys

M. Jayaprakash, D. H. Ping, Y. Yamabe-Mitarai

Integrated Research Division

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

The effect of Si₃N₄ addition on the mechanical properties and microstructure of Ti-Al-Zr-Sn based near-α Ti alloys has been systematically investigated at both room temperature and high temperature (650°C). Minor Mo and Ta (β stabilizing elements) together with Si₃N₄ addition have significantly improved the compressive yielding strength at both room temperature and 650°C. The strengthening effect was mainly due to the precipitation of TiN, α_2-Ti₃Al and the retained β phase. High compressive yielding strength together with pronounced ductility can be obtained by only adding minor Si₃N₄ into Ti-Al-Zr-Sn alloys. The enhanced ductility is probably due to the depression of the brittle α₂ intermetallic phase, which did not precipitate out even after long time ageing (750°C for 500h).

Original language	English
Pages (from-to)	131-139
Number of pages	9
Journal	Materials Science and Engineering A
Volume	625
DOIs	https://doi.org/10.1016/j.msea.2014.11.099
Publication status	Published - 2015 Feb 1

Keywords

Compression test
Microstructure
Scanning electron microscopy (SEM)
Ti-alloy
Transmission electron microscopy (TEM)

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Enhanced yielding strength of near-α Ti-Al-Zr-Sn high temperature alloys",

abstract = "The effect of Si3N4 addition on the mechanical properties and microstructure of Ti-Al-Zr-Sn based near-α Ti alloys has been systematically investigated at both room temperature and high temperature (650°C). Minor Mo and Ta (β stabilizing elements) together with Si3N4 addition have significantly improved the compressive yielding strength at both room temperature and 650°C. The strengthening effect was mainly due to the precipitation of TiN, α2-Ti3Al and the retained β phase. High compressive yielding strength together with pronounced ductility can be obtained by only adding minor Si3N4 into Ti-Al-Zr-Sn alloys. The enhanced ductility is probably due to the depression of the brittle α2 intermetallic phase, which did not precipitate out even after long time ageing (750°C for 500h).",

keywords = "Compression test, Microstructure, Scanning electron microscopy (SEM), Ti-alloy, Transmission electron microscopy (TEM)",

author = "M. Jayaprakash and Ping, {D. H.} and Y. Yamabe-Mitarai",

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doi = "10.1016/j.msea.2014.11.099",

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T1 - Enhanced yielding strength of near-α Ti-Al-Zr-Sn high temperature alloys

AU - Jayaprakash, M.

AU - Ping, D. H.

AU - Yamabe-Mitarai, Y.

PY - 2015/2/1

Y1 - 2015/2/1

N2 - The effect of Si3N4 addition on the mechanical properties and microstructure of Ti-Al-Zr-Sn based near-α Ti alloys has been systematically investigated at both room temperature and high temperature (650°C). Minor Mo and Ta (β stabilizing elements) together with Si3N4 addition have significantly improved the compressive yielding strength at both room temperature and 650°C. The strengthening effect was mainly due to the precipitation of TiN, α2-Ti3Al and the retained β phase. High compressive yielding strength together with pronounced ductility can be obtained by only adding minor Si3N4 into Ti-Al-Zr-Sn alloys. The enhanced ductility is probably due to the depression of the brittle α2 intermetallic phase, which did not precipitate out even after long time ageing (750°C for 500h).

AB - The effect of Si3N4 addition on the mechanical properties and microstructure of Ti-Al-Zr-Sn based near-α Ti alloys has been systematically investigated at both room temperature and high temperature (650°C). Minor Mo and Ta (β stabilizing elements) together with Si3N4 addition have significantly improved the compressive yielding strength at both room temperature and 650°C. The strengthening effect was mainly due to the precipitation of TiN, α2-Ti3Al and the retained β phase. High compressive yielding strength together with pronounced ductility can be obtained by only adding minor Si3N4 into Ti-Al-Zr-Sn alloys. The enhanced ductility is probably due to the depression of the brittle α2 intermetallic phase, which did not precipitate out even after long time ageing (750°C for 500h).

KW - Compression test

KW - Microstructure

KW - Scanning electron microscopy (SEM)

KW - Ti-alloy

KW - Transmission electron microscopy (TEM)

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