Elevated temperature deformation of several quaternary L12Al3Ti based alloys reinforced with TiB2 particles
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Concurrent with an investigation of quaternary cast and forged L12 modified Al3Ti's containing 9 at% Cr, Fe and/or Mn, a similar series of four alloys was produced via XDTM technology, whereby 20 vol% of ∼ 0.5 μm TiB2 particles was incorporated as a reinforcement. Following densification by hot pressing and slow isothermal forging, small diameter compression test samples were machined from each compact and tested. The 0.2% yield strength measurements revealed a strength advantage for the particulate reinforced materials over the unreinforced ingot metallurgy matrices to about 1175 K. Furthermore, 900 and 1100 K constant velocity testing indicated that the TiB2 containing materials were stronger than the ingot metallurgy matrices down to strain rates of ∼ 10−7s−1. None of the quaternary L12 alloys + 20 TiB2 consistently displayed a strength advantage over others. However, extrapolation of the present mechanical property data into slower strain regimes indicated that the composites will not possess any strength advantage overthe unreinforced versions. Such losses in strength appeared to be caused by small grains in the particulate reinforced alloys, which promoted grain boundary weakening mechanisms.
KeywordsYield Strength Compression Test Temperature Deformation Property Data Strength Measurement
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