Materials Transactions, Vol.59 No.05 (2018) pp.734-740
© 2018 The Japan Institute of Metals and Materials
Effect of Heat Treatment within Alpha/Beta Dual-Phase Field on the Structure and Tensile Properties of Binary Ti-Mo Alloys
Department of Materials Science and Engineering, National Cheng-Kung University, Tainan 70101, Taiwan, ROC
The present study investigated the effect of heat treatment within the alpha (α)/beta (β) dual-phase field on the structure and tensile properties of Ti-(1.5-9.5) mass% Mo alloys. The alloys were prepared using an arc-melting vacuum-pressure type casting system. The cast alloys were heat-treated at 700, 750 and 800°C in vacuum for 30 minutes followed by quenching in ice water. The X-ray diffraction (XRD) results indicated that beta (β) phase intensities increased while α/alpha prime (α′) intensities decreased with increased heat treatment temperature (HTT) and Mo concentration. The β phase was observed to dominate the 800°C-treated Ti-9.5Mo alloy, while the highest alpha double prime (α′′) phase content was observed in the 800°C-treated Ti-7.5Mo alloy. Both optical and scanning electron microscopy indicated that a relatively coarse α platelet was always observed in Ti-1.5Mo. A fine, uniformly-distributed acicular microstructure was observed in Ti-7.5Mo, while an equi-axed β granular microstructure was clearly seen in Ti-9.5Mo. The tensile properties were found sensitive to the HTT and Mo concentration. When heat-treated at 700°C, the yield strength (YS) and ultimate tensile strength (UTS) increased while the elongation generally decreased with Mo concentration. The highest YS and UTS were found in Ti-7.5Mo and Ti-9.5Mo. When heat-treated at 750°C, the strength of Ti-5.5Mo was improved without reducing elongation. With Mo concentration increased to 7.5% or higher, the elongation further increased while the strength maintained a similar level. When treated at 800°C, the YS of Ti-3.5Mo, Ti-5.5Mo and Ti-7.5Mo maintained a lower level than Ti-1.5Mo and Ti-9.5Mo. A fully satisfactory interpretation for the tensile properties and their relationships to the complicated microstructures might not be a simple task due to several different factors simultaneously involved, yet practically it is interesting to note that selected alloys heat-treated within the dual-phase field demonstrated quite promising overall mechanical properties.
(Received 2017/12/04; Accepted 2018/02/19; Published 2018/04/25)
Keywords: titanium alloy, titanium-molybdenum alloy, α/β dual-phase
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