Equiaxed Ti-based composites with high strength and large plasticity prepared by sintering and crystallizing amorphous powder

被引：50
作者：
Liu, L. H. [1 ,2 ]
Yang, C. [1 ]
Kang, L. M. [1 ]
Long, Y. [1 ]
Xiao, Z. Y. [1 ]
Li, P. J. [2 ]
Zhang, L. C. [3 ]
机构：
[1] S China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangzhou 510640, Guangdong, Peoples R China
[2] Tsinghua Univ, Dept Mech Engn, Beijing 100084, Peoples R China
[3] Edith Cowan Univ, Sch Engn, Perth, WA 6027, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 650卷
基金：
中国国家自然科学基金;
关键词：
Titanium alloys; Powder metallurgy; Amorphous alloy; Mechanical properties; Equiaxed microstructure; BULK METALLIC-GLASS; GRAINED TI66NB13CU8NI6.8AL6.2 COMPOSITES; NANOSTRUCTURE-DENDRITE COMPOSITE; MECHANICAL-PROPERTIES; FORMING ABILITY; ALLOYS; SN; MICROSTRUCTURE; NI; CU;
D O I：
10.1016/j.msea.2015.10.048
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High-performance titanium alloys with an equiaxed composite microstructure were achieved by sintering and crystallizing amorphous powder. By introducing a second phase in a beta-Ti matrix, series of optimized Ti-Nb-Fe-Co-Al and Ti-Nb-Cu-Ni-Al composites, which have a microstructure composed of ultrafine-grained and equiaxed CoTi2 or (Cu,Ni)Ti-2 precipitated phases surrounded by a ductile beta-Ti matrix, were fabricated by sintering and crystallizing mechanically alloyed amorphous powder. The asfabricated composites exhibit ultra-high ultimate compressive strength of 2585 MPa and extremely large compressive plastic strain of around 40%, which are greater than the corresponding ones for most titanium alloys. In contrast, the alloy fabricated by sintering and crystallizing Ti-Zr-Cu-Ni-Al amorphous powder, which possesses significantly higher glass forming ability in comparison with the Ti-Nb-Fe-Co-Al and Ti-Nb-Cu-Ni-Al alloy systems, exhibits a complex microstructure with several intermetallic compounds and a typical brittle fracture feature. The deformation behavior and fracture mechanism indicate that the ultrahigh compressive strength and large plasticity of the as-fabricated equiaxed composites is induced by dislocations pinning effect of the CoTi2 or (Cu,Ni)Ti-2 second phases and the interaction and multiplication of generated shear bands in the ductile beta-Ti matrix, respectively. The results obtained provide basis guidelines for designing and fabricating titanium alloys with excellent mechanical properties by powder metallurgy. (C) 2015 Elsevier B.V. All rights reserved.
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页码：171 / 182
页数：12
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