|About this Abstract
||Materials Science & Technology 2019
||Powder Metallurgy of Light, Reactive and Other Non-ferrous Metals
||Design and Fabrication of Strong and Ductile (tensile) Powder Metallurgy Titanium Metal Matrix Composites
||Ma Qian, Shudong Luo, Tingting Song, Bing Liu
|On-Site Speaker (Planned)
TiMMCs can offer much improved strength, elastic modulus, and wear resistance at both room and elevated temperatures but often at the expense of tensile ductility, which excludes them from most key engineering applications. Recent advances have shown that this long-standing strength-ductility dilemma can be overcome to a large extent by adopting novel design concepts based on powder metallurgy (PM). These include: 1) reinforcing the Ti matrix with a three-dimensional (3D) network-like architecture of TiB whiskers or nanowires; 2) the use of nanostructured carbon precursors (nanotubes, fibers and graphene) to enable in situ formation of TiC reinforcements; and 3) the utilization of ‘ductility-detrimental’ interstitial elements (O, N, H) for strengthening. The resultant TiMMCs all exhibited an excellent combination of tensile strength and elongation, comparable to, or even better than, solution-treated and aged (STA) wrought Ti-6Al-4V. The mechanisms behind these novel developments are analyzed.