Formation process and cross-sectional hardness of a Cr-alloyed layer on Ti6Al4V alloy

Shouming Yu; Daoxin Liu; Tengfei Cui; Xiaohua Zhang

doi:10.1016/j.matlet.2015.09.024

Formation process and cross-sectional hardness of a Cr-alloyed layer on Ti6Al4V alloy

Shouming Yu
, Daoxin Liu
, Tengfei Cui
, Xiaohua Zhang

Northwestern Polytechnical University Xian

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

12 Scopus citations

Abstract

A Cr-alloyed layer consisting of five sublayers was prepared on Ti6Al4V substrate via double glow plasma surface alloying technology at 800 °C. The formation process and cross-sectional hardness of the Cr-alloyed layer were studied in detail. The results showed that a set of new phase layers (i.e., Cr, TiCr₂, Ti₄Cr, (βTi,Cr) and (αTi,Cr) sublayers) formed at 800 °C; however, the (βTi,Cr) phase decomposed and separated out the Ti₄Cr phase when the temperature decreased. Additionally, the TiCr₂ phase had the highest hardness while Ti₄Cr phase had the lowest hardness. Precipitation of the soft Ti₄Cr phase from the (βTi,Cr) phase therefore limited the improvement of the hardness and led to an unusual change: increasing the Cr content led to a lower hardness.

Original language	English
Article number	19540
Pages (from-to)	724-726
Number of pages	3
Journal	Materials Letters
Volume	161
DOIs	https://doi.org/10.1016/j.matlet.2015.09.024
State	Published - 15 Dec 2015

Keywords

Cr-alloyed layer
Cross-sectional hardness
Diffusion
Phase transformation
Ti<inf>4</inf>Cr phase

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10.1016/j.matlet.2015.09.024

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title = "Formation process and cross-sectional hardness of a Cr-alloyed layer on Ti6Al4V alloy",

abstract = "A Cr-alloyed layer consisting of five sublayers was prepared on Ti6Al4V substrate via double glow plasma surface alloying technology at 800 °C. The formation process and cross-sectional hardness of the Cr-alloyed layer were studied in detail. The results showed that a set of new phase layers (i.e., Cr, TiCr2, Ti4Cr, (βTi,Cr) and (αTi,Cr) sublayers) formed at 800 °C; however, the (βTi,Cr) phase decomposed and separated out the Ti4Cr phase when the temperature decreased. Additionally, the TiCr2 phase had the highest hardness while Ti4Cr phase had the lowest hardness. Precipitation of the soft Ti4Cr phase from the (βTi,Cr) phase therefore limited the improvement of the hardness and led to an unusual change: increasing the Cr content led to a lower hardness.",

keywords = "Cr-alloyed layer, Cross-sectional hardness, Diffusion, Phase transformation, Ti<inf>4</inf>Cr phase",

author = "Shouming Yu and Daoxin Liu and Tengfei Cui and Xiaohua Zhang",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

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doi = "10.1016/j.matlet.2015.09.024",

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}

TY - JOUR

T1 - Formation process and cross-sectional hardness of a Cr-alloyed layer on Ti6Al4V alloy

AU - Yu, Shouming

AU - Liu, Daoxin

AU - Cui, Tengfei

AU - Zhang, Xiaohua

PY - 2015/12/15

Y1 - 2015/12/15

N2 - A Cr-alloyed layer consisting of five sublayers was prepared on Ti6Al4V substrate via double glow plasma surface alloying technology at 800 °C. The formation process and cross-sectional hardness of the Cr-alloyed layer were studied in detail. The results showed that a set of new phase layers (i.e., Cr, TiCr2, Ti4Cr, (βTi,Cr) and (αTi,Cr) sublayers) formed at 800 °C; however, the (βTi,Cr) phase decomposed and separated out the Ti4Cr phase when the temperature decreased. Additionally, the TiCr2 phase had the highest hardness while Ti4Cr phase had the lowest hardness. Precipitation of the soft Ti4Cr phase from the (βTi,Cr) phase therefore limited the improvement of the hardness and led to an unusual change: increasing the Cr content led to a lower hardness.

AB - A Cr-alloyed layer consisting of five sublayers was prepared on Ti6Al4V substrate via double glow plasma surface alloying technology at 800 °C. The formation process and cross-sectional hardness of the Cr-alloyed layer were studied in detail. The results showed that a set of new phase layers (i.e., Cr, TiCr2, Ti4Cr, (βTi,Cr) and (αTi,Cr) sublayers) formed at 800 °C; however, the (βTi,Cr) phase decomposed and separated out the Ti4Cr phase when the temperature decreased. Additionally, the TiCr2 phase had the highest hardness while Ti4Cr phase had the lowest hardness. Precipitation of the soft Ti4Cr phase from the (βTi,Cr) phase therefore limited the improvement of the hardness and led to an unusual change: increasing the Cr content led to a lower hardness.

KW - Cr-alloyed layer

KW - Cross-sectional hardness

KW - Diffusion

KW - Phase transformation

KW - Ti<inf>4</inf>Cr phase

UR - https://www.scopus.com/pages/publications/84942517869

U2 - 10.1016/j.matlet.2015.09.024

DO - 10.1016/j.matlet.2015.09.024

M3 - 文章

AN - SCOPUS:84942517869

SN - 0167-577X

VL - 161

SP - 724

EP - 726

JO - Materials Letters

JF - Materials Letters

M1 - 19540

ER -

Formation process and cross-sectional hardness of a Cr-alloyed layer on Ti6Al4V alloy

Abstract

Keywords

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