Fabrication of Ultrafine-Grained Ti66Nb18Cu6.4Ni6.1Al3.5 Composites with High Strength and Distinct Plasticity by Spark Plasma Sintering and Crystallization of Amorphous Phase

Weiping Chen; Xuemei Wu; Chao Yang; Xiaoqiang Li; Mindan Chen; Yuanyuan Li

doi:10.2320/matertrans.MD201110

Fabrication of Ultrafine-Grained Ti₆₆Nb₁₈Cu_6.4Ni_6.1Al_3.5 Composites with High Strength and Distinct Plasticity by Spark Plasma Sintering and Crystallization of Amorphous Phase

Weiping Chen, Xuemei Wu, Chao Yang, Xiaoqiang Li, Mindan Chen, Yuanyuan Li

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Keywords: titanium alloys, ultrafine-grained composites, amorphous alloys, spark plasma sintering, crystallization

JOURNAL FREE ACCESS

2012 Volume 53 Issue 3 Pages 531-536

DOI https://doi.org/10.2320/matertrans.MD201110

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Abstract

Ductile ultrafine-grained composites in Ti₆₆Nb₁₈Cu_6.4Ni_6.1Al_3.5 alloy with high Nb/Ti ratio were fabricated by spark plasma sintering and crystallization of amorphous phase. Microstructure observations shows that all alloys encompass body-centered cubic β-Ti and face-centered cubic (Cu, Ni)-Ti₂ regions but display different microstructures. The alloys exhibit a high fracture strength as high as 2365 MPa as well as distinct fracture strain of ∼7.6%. The results obtained provide a promising method for fabrication of two-phase composites with good combination of strength and ductility by powder metallurgy.

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