Strong and Ductile Ti-6Al-4V Alloy Produced by Hot Pressing of Ti-6Al-4V Swarf
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Ti-6Al-4V (Ti-64) swarf is produced every day in commercial operations but its direct use for the fabrication of strong and ductile Ti-6Al-4V alloy is seldom reported. This study consolidated as-received Ti-64 swarf into near fully dense Ti-6Al-4V alloy by hot pressing. The microstructures and tensile mechanical properties of the hot-pressed Ti-64 alloy and the effect of subsequent solution treatment and ageing (STA) were studied. The hot-pressed Ti-64 achieved tensile yield strength (TYS) of 928–998 MPa, ultimate tensile strength (UTS) of 1076–1139 MPa and strain to fracture of 6.92–7.80%. The STA increased the TYS to 1103–1143 MPa and UTS to 1188–1223 MPa, accompanied by a decline in the strain to fracture to 5.32–6.48%. These tensile property data suggest that it is possible to directly consolidate Ti-6Al-4V swarf into a strong and ductile Ti-6Al-4V alloy by hot pressing for a variety of potential applications.
The authors from the University of Waikato gratefully acknowledge the funding support from the Strategic Investment Fund of the University of Waikato, New Zealand (Grant No. 2018-SIF-106309), and Ministry of Business, Innovation and Employment (MBIE), New Zealand (Contract no. UOWX1402) and the Australian team thanks the Australian Defence Science and Technology Group (DSTG) for funding this research.