Structure-property correlations of W-Ni-Fe-Mo heavy alloys consolidated using spark plasma sintering

A. Muthuchamy, Digvijay Yadev, Dinesh K. Agrawal, Raja Annamalai

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2 Scopus citations

Abstract

W-Ni-Fe-Mo powders were mixed and sintered at 1100 °C and 50 MPa pressure, using spark plasma sintering method. The sintering parameters were optimized for 90W-7Ni-3Fe alloy and the effect of Mo addition on the final mechanical properties of the alloy (xW-7Ni-3Fe-yMo) was studied in detail. Addition of molybdenum has resulted in greater sinterability of xW-7Ni-3Fe-yMo alloys. The mechanical properties were found to be dependent on the grain size of tungsten and the homogeneity of the microstructure. It was observed from the results that, 74W-7Ni-3Fe-16Mo alloy exhibits highest strength (1150 MPa) and highest sintered density (92.65%) as compared to the other xW-7Ni-3Fe-yMo alloys under investigation. The tensile fracture surface microstructure is characterized as tungsten-tungsten inter-granular separation, tungsten trans-granular cleavage, matrix ductile rupture and local matrix rupture on the separated tungsten-tungsten interfaces.

Original languageEnglish (US)
Article number026545
JournalMaterials Research Express
Volume6
Issue number2
DOIs
StatePublished - Feb 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Metals and Alloys

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