High strength Ti-6Al-4V alloy fabricated by high-energy cube milling using calcium as process control agent (PCA) and spark plasma sintering

  • N. Kishore Babu
  • Kaspar Kallip
  • Marc Leparoux
  • Khaled A. AlOgab
  • M.K. Talari
  • N. M. Alqahtani
ORIGINAL ARTICLE
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Abstract

The present study has investigated the influence of calcium process control agent on the microstructure and mechanical properties of powder metallurgy processed samples fabricated by milling and spark plasma sintering technique. The microstructure of spark plasma sintered Ti-6Al-4V with 0.3 wt% Ca (Ti-6Al-4V-0.3Ca-M) samples revealed fine grain structure compared to sintered unmilled (Ti-6Al-4V-UM) samples. The average grain size values of sintered Ti-6Al-4V-0.3Ca-M and Ti-6Al-4V-UM samples are 8 and 60 μm, respectively. The spark plasma sintered Ti-6Al-4V-UM exhibited a yield strength (YS) of 875 ± 10 MPa, ultimate tensile strength (UTS) of 1057 ± 2 MPa, and % elongation (% El) of 15 ± 2. The spark plasma sintered Ti-6Al-4V-0.3Ca-M exhibited higher YS of 964 ± 9 MPa, UTS of 1153 ± 7 MPa, and lower % El of 6 ± 1 when compared to mill annealed Ti-6Al-4V alloy (YS 899 MPa, UTS 978 MPa and %El 15). The higher strength of Ti-6Al-4V-0.3Ca-M sintered samples could be attributed to the fine grain structure and the presence of interstitial elements in the matrix. In contrast, the lower strength of Ti-6Al-4V-UM can be ascribed to its coarse grains.

Keywords

Spark plasma sintering Calcium Ti-6Al-4V Microstructure Hardness Mechanical properties 

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Copyright information

© Springer-Verlag London 2017

Authors and Affiliations

  • N. Kishore Babu
    • 1
  • Kaspar Kallip
    • 1
  • Marc Leparoux
    • 1
  • Khaled A. AlOgab
    • 2
  • M.K. Talari
    • 3
  • N. M. Alqahtani
    • 2
  1. 1.Empa, Swiss Federal Laboratories for Material Science and TechnologyLaboratory for Advanced Materials ProcessingThunSwitzerland
  2. 2.King Abdulaziz City for Science and Technology (KACST)National Centers for Advanced MaterialsRiyadhSaudi Arabia
  3. 3.Faculty of Applied SciencesUniversiti Teknologi MARAShah AlamMalaysia

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