Current-Assisted Diffusion Bonding of Extruded Ti-22Al-25Nb Alloy by Spark Plasma Sintering: Interfacial Microstructure and Mechanical Properties

被引：18

作者：

Yang, Jianlei ^{[1
]}

Wang, Guofeng ^{[1
,2
]}

Jiao, Xueyan ^{[1
]}

Gu, Yibin ^{[1
]}

Liu, Qing ^{[1
]}

Li, You ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 06期

基金：

中国国家自然科学基金;

关键词：

diffusion bonding; mechanical property; microstructure; spark plasma sintering; Ti2AlNb-based alloys; WELDED TI2ALNB ALLOY; TENSILE PROPERTIES; ORTHORHOMBIC ALLOYS; HEAT-TREATMENT; EVOLUTION; JOINTS; FABRICATION; RESISTANCE; PRESSURE; TITANIUM;

D O I：

10.1007/s11665-018-3398-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Spark plasma sintering (SPS) technology was used to current-assisted bond extruded Ti-22Al-25Nb alloy. The effects of bonding temperature (920-980 A degrees C) and bonding time (10-30 min) on the microstructure evolution and shear strength of this alloy were investigated systematically. The temperature distribution in the specimen during the current-assisted bonding process was also analyzed by numerical simulation. It is noted that the highest temperature was obtained at the bonding interface. As the bonding temperature and bonding time increased, the voids in the interface shrank increasingly until they vanished. A complete metallurgical bonding interface could be produced at 960 A degrees C/20 min/10 MPa, exhibiting the highest shear strength of 269.3 MPa. In addition, the shear strength of the bonded specimen depended on its interfacial microstructure. With increased bonding temperature, the fracture mode transformed from the intergranular fracture at the bonding interface to the cleavage fracture in the substrate.

引用

页码：3035 / 3043

页数：9

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