Matrials Science and Engineering A, ( ISI ), Volume (624), Year (2015-1) , Pages (271-278)

Title : ( Influence of spark plasma sintering and subsequent hot rolling on microstructure and flexural behavior of in-situ TiB and TiC reinforced Ti-6Al-4V composite )

Authors: Saeid GHESMATITABRIZI , Seyed Abdolkarim Sajjadi , Abolfazl Babakhani , Weijie Lu ,

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Powder mixture consisting of Ti6Al4V and B4C was sintered at 1100°C by spark plasma sintering (SPS) to produce Ti – alloy matrix composite reinforced by in-situ TiB whiskers (TiBw) and TiC particles (TiCp). The reinforcement content was chosen in the range of 0.5-2 vol.% TiBw and 0.12-0.5 vol.% TiCp. In order to investigate the effect of hot deformation on microstructure and mechanical properties of the composites, hot rolling was performed at 900°C with 66% reduction ratio. The microstructure parameters such as lamellar colony size, alpha layer spacing and aspect ratio of whiskers were measured using image analysis. The results showed refinement of alternate α/β lamellae and alignment of TiBw in rolling direction of the rolled samples. Three-point bending test results showed that among the sintered samples, the Ti6Al4V-0.5vol.%TiBw-0.12vol.%TiCp sample gained the highest flexural yield strength, equal to 1850 MPa. After hot rolling with 66% reduction, the maximum flexural strength reached 2100 MPa in Ti6Al4V-1vol.%TiBw-0.23vol.%TiCp composite. Fractography of the composite samples processed by SPS showed that clustering of whiskers caused a reduction in flexural strength at higher reinforcement contents.

Keywords

, Ti6Al4V, TiB whiskers, TiC particles, sintering, rolling, flexural
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@article{paperid:1044469,
author = {GHESMATITABRIZI, Saeid and Sajjadi, Seyed Abdolkarim and Babakhani, Abolfazl and Weijie Lu},
title = {Influence of spark plasma sintering and subsequent hot rolling on microstructure and flexural behavior of in-situ TiB and TiC reinforced Ti-6Al-4V composite},
journal = {Matrials Science and Engineering A},
year = {2015},
volume = {624},
month = {January},
issn = {0921-5093},
pages = {271--278},
numpages = {7},
keywords = {Ti6Al4V; TiB whiskers; TiC particles; sintering; rolling; flexural behavior},
}

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%0 Journal Article
%T Influence of spark plasma sintering and subsequent hot rolling on microstructure and flexural behavior of in-situ TiB and TiC reinforced Ti-6Al-4V composite
%A GHESMATITABRIZI, Saeid
%A Sajjadi, Seyed Abdolkarim
%A Babakhani, Abolfazl
%A Weijie Lu
%J Matrials Science and Engineering A
%@ 0921-5093
%D 2015

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