Processing and characterization of spark plasma sintered TZM alloy

Danisman C. B., YAVAS B., YUCEL O., SAHIN F., Göller G.

JOURNAL OF ALLOYS AND COMPOUNDS, vol.685, pp.860-868, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Review
  • Volume: 685
  • Publication Date: 2016
  • Doi Number: 10.1016/j.jallcom.2016.06.161
  • Journal Name: JOURNAL OF ALLOYS AND COMPOUNDS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.860-868
  • Keywords: TZM alloy, SPS, Sintering, Molybdenum, Refractory metals, MECHANICAL-PROPERTIES, MICROSTRUCTURE, TEMPERATURE
  • Istanbul Technical University Affiliated: Yes

Abstract

TZM is one of the most important molybdenum based alloys having a nominal composition of Mo-0.5 Ti -0.1 Zr-0.02 C (wt. %). This alloy possesses high temperature strength, high creep resistance, low coefficient of thermal expansion, and high thermal conductivity. TZM alloy processed contains TiC, ZrC and complex carbides which inhibit recrystallization at high temperatures improving its performances at harsh conditions. In this study pre-alloyed TZM powder was sintered by spark plasma sintering (SPS) at various sintering temperatures, holding times and pressures to investigate the effect of sintering conditions on densification, microstructure and hardness. In all cases, TiC and ZrC precipitations was observed throughout the microstructure. The average sizes of precipitates were measured as 7.5 and 3.5 mm for TiC and ZrC, respectively. The sample sintered at 1450 degrees C under 80 MPa for 150 s showed optimum properties as 95.5% of relative density, 8.5 +/- 2 mu m of average grain size, 2.04 +/- 0.03 GPa of hardness, and 25.95 +/- 3 MPa m(1/2) fracture toughness. (C) 2016 Elsevier B.V. All rights reserved.