Microstructure and mechanical properties of TA15-Ti2AlNb bimetallic structures by laser additive manufacturing

被引：34

作者：

Liu, Yantao ^{[1
,2
]}

Zhang, Yongzhong ^{[1
,2
]}

机构：

[1] GRIMAT Engn Inst Co Ltd, Beijing 101407, Peoples R China

[2] Grinm Met Composites Technol Co Ltd, Beijing 101407, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 795卷

基金：

中国国家自然科学基金;

关键词：

Laser additive manufacturing; Bimetallic structures; Microstructure; Mechanical properties; PHASE EVOLUTION; GRADIENT; INTERFACE; ALLOYS;

D O I：

10.1016/j.msea.2020.140019

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The TA15-Ti2AlNb bimetallic samples with no defects were prepared by laser additive manufacturing. The evolution of the composition and microstructure in transition zone, and the mechanical properties were investigated. Composition in the transition region shows a step-and-platform distribution due to the rapid solidification and diffusion during the depositing process. The phase transformation from TA15 alloy side to Ti2AlNb-based alloy side is alpha (lath) +beta ->alpha (coarse acicular) +beta ->beta+alpha(2)->alpha(2)+O + B2. The TA15-Ti2AlNb bimetallic structures present tensile properties with average tensile strength of 1025 MPa and elongation of 7.3%. The fracture position of samples is located in diffusion zone, and the fracture mode is quasi-cleavage fracture. The TA15-Ti2AlNb bimetallic circular structure with bell mouth was fabricated and this work shows great potential for fabricating bimetallic structures by laser additive manufacturing technology.

引用

页数：9