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Microstructural Investigation of TZM Alloys processed by Spark Plasma Sintering

Published online by Cambridge University Press:  28 December 2015

Can Burak Danışman ,
Filiz Şahin ,
Onuralp Yücel  and
Gültekin Göller
Can Burak Danışman
Affiliation:
Istanbul Technical University, Department of Metallurgical and Materials Engineering, Istanbul, Turkey
Filiz Şahin
Affiliation:
Istanbul Technical University, Department of Metallurgical and Materials Engineering, Istanbul, Turkey
Onuralp Yücel
Affiliation:
Istanbul Technical University, Department of Metallurgical and Materials Engineering, Istanbul, Turkey
Gültekin Göller*
Affiliation:
Istanbul Technical University, Department of Metallurgical and Materials Engineering, Istanbul, Turkey
*
*(Email: [email protected])
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Abstract

Molybdenum based alloy having a nominal composition Mo–0.5Ti–0.1Zr–0.02C (wt%) popularly known as TZM alloy possess high temperature strength, high creep resistance, low coefficient of thermal expansion and high thermal conductivity. Processed TZM alloy contains TiC, ZrC and complex carbides which inhibit recrystallization at high temperatures and also improve the working conditions. In this study, the effect of sintering temperature, holding time and pressure on densification, microstructure and hardness of the spark plasma sintered TZM alloys were investigated. The sample sintered at 1575 °C for 150 second under 40 MPa exhibited the highest relative density, ∼98%. Microstructural characterization was performed by using FESEM and it was observed that TiC and ZrC dispersed through the microstructure. The average size of precipitates were measured as 7.5 and 3.5 µm for TiC and ZrC, respectively.

Keywords

sinteringpowder metallurgyMo
Type
Articles
Information
MRS Advances , Volume 1 , Issue 17: Mechanical Behaviour and Failure of Materials , 2016 , pp. 1183 - 1190
Copyright
Copyright © Materials Research Society 2015 

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