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Ti-4.3Fe-7.1Cr-3Al Alloy Prepared by Spark Plasma Sintering
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    Abstract:

    A low-cost vehicle titanium alloy (Ti-4.3Fe-7.1Cr-3Al) was prepared by spark plasma sintering process. Effects of the sintering temperature on the grain size, porosity, microstructure, composition uniformity, phase structure and mechanical properties were investigated. The results show that the microstructure of both samples sintered at 1100 or 1300 oC contain acicular α phase and β basic phase, with short strips and granular TiC distributing among them. Grain size and TiC precipitation density increase but the porosity and α phase decrease with the sintering temperature increasing, and the α phase distribution turns more and more even. Electron probe microanalysis shows that, the components have poor homogeneousness, segregation of Cr and Al occurs at 1100 oC, but disappears at 1300 oC. XRD analysis and nano-mechanical microprobe measurement show that additive elements cause the decrease of β phase lattice parameters and the precipitation of fine second phase, so the elastic modulus increases.

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[Jiao Zehui, Song Xiping. Ti-4.3Fe-7.1Cr-3Al Alloy Prepared by Spark Plasma Sintering[J]. Rare Metal Materials and Engineering,2012,41(2):330~334.]
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  • Received:February 16,2011
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