Crystallization kinetics and spark plasma sintering of amorphous Ni53Nb20Ti10Zr8Co6Ta3 powders prepared by mechanical alloying

被引：18

作者：

Li, Xiaoqiang ^{[1
]}

Cheng, Zhun ^{[1
]}

Hu, Ke ^{[1
]}

Chen, Huojin ^{[1
]}

Yang, Chao ^{[1
]}

机构：

[1] S China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Technol, Guangzhou 510640, Guangdong, Peoples R China

来源：

VACUUM | 2015年 / 114卷

关键词：

Mechanical alloying; Crystallization kinetics; Spark plasma sintering; Mechanical properties; GLASS-FORMING ABILITY; THERMAL-STABILITY; METALLIC-GLASS; CONSOLIDATION; BEHAVIOR; TI; COMPOSITES; STRENGTH;

D O I：

10.1016/j.vacuum.2015.01.002

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Amorphous Ni53Nb20Ti10Zr8Co6Ta3 powders were successfully fabricated by mechanical alloying. The glass-forming ability and crystallization behavior of the synthesized alloy powders were investigated by X-ray diffraction, transmission electron microscopy and differential scanning calorimetry. The non-isothermal crystallization kinetics were analyzed by the Johnson-Mehl-Avrami equation. The crystallization of the amorphous Ni53Nb20Ti10Zr8Co6Ta3 powders exhibits two distinct steps, and the values of the Avrami exponent n implies that the crystallization of the first and second steps are dominated by interface-controlled three-dimensional growth as well as the volume-diffusion-controlled two-dimensional growth, respectively. In addition, the bulk crystallized alloys consolidated from the amorphous powders by spark plasma sintering exhibit high fracture strength of 3169 MPa and ultra-high hardness of 1069 HV. The compressive fracture strength and fracture strain of the as sintered alloy at 1073 K reach 2020 MPa and 7.6%, respectively. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：93 / 100

页数：8

共 37 条

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