Materials Transactions Online

Materials Transactions, Vol.53 No.03 (2012) pp.531-536
© 2012 The Japan Institute of Metals

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 and Yuanyuan Li

National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, P. R. China

Ductile ultrafine-grained composites in Ti66Nb18Cu6.4Ni6.1Al3.5 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.

(Received 2011/08/25; Accepted 2011/12/06; Published 2012/02/25)

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

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