Mr. Shagiev et al., High temperature mechanical properties of a submicrocrystalline Ti-47Al-3Cr alloy produced by mechanical alloying and hot isostatic pressing, J ALLOY COM, 313, 2000, pp. 201-208
High temperature tensile properties of a TiAl-based alloy with a submicrocr
ystalline structure were studied in the temperature range of 800 to 1200 de
greesC and the strain rate range of 10(-4) to 3x10(-1) s(-1). The alloy was
produced by hot isostatic pressing of an amorphous mechanically alloyed po
wder and contained two phases, TiAl and Ti2AlN; the latter resulted from co
ntamination of the powder with nitrogen during mechanical alloying. Two tem
perature ranges with different behavior were distinguished. In the temperat
ure range of 800 to 950 degreesC, the stress exponent, n=6, and the activat
ion energy of deformation, Q=497 kJ mol(-1), were typical to a climb contro
lled deformation mechanism. In the temperature range 1000 to 1200 degreesC,
the stress exponent, n=3, and the activation energy, Q=347 kJ mol(-1), wer
e determined together with high elongation indicating superplastic behavior
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