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Ti­Al alloy demonstrates high strength in high-temperature environments. Thus, the Ti­Al alloys are expected in an application as high temperature materials. However, the Ti­Al alloys demonstrate low strength and limited ductility at room temperature. Harmonic-structured materials with a network fine grain structure and a dispersed coarse grain structure show high strength and sufficient ductility at room temperature. In addition, a composite of different materials is also effective in improving both strength and ductility. Therefore, the harmonicstructured composite with pure titanium (Ti) and Ti­48 at%Al alloy (Ti­48Al) were fabricated by the combination of the mechanical milling (MM) and the spark plasma sintering (SPS) process. The harmonic-structured composite has a fine grained network Ti­Al alloy and a dispersed coarse grain Ti region. The XRD result reveals that the harmonic-structured composite composes of Ti, TiAl and Ti3Al phases. The harmonicstructured composite demonstrates high strength and sufficient ductility compared with the conventional compact consisting of only Ti­48Al. Advanced ductility of the harmonic-structured composite is attributed to an obstruction of the crack propagation by the dispersed coarse grain region. After heat treatment of the Ti/Ti­48Al harmonic-structured composite, its hardness decreased to much lesser than that of the pure Ti compact. [doi:10.2320/matertrans.MH201317]

Mechanical Properties of Harmonic Structured Composite with Pure Titanium and Ti&ndash;48 at%Al Alloy by MM/SPS Process

Mechanical Properties of Harmonic Structured Composite with Pure Titanium and Ti–48 at%Al Alloy by MM/SPS Process