Investigation on the microstructure and mechanical properties of gum metal TNTZO titanium alloy prepared by selective laser melting

作者：Xu, Hao; Lv, Ping; Li, Zhongjie; Xu, Huan; Hu, Muling; Dong, Anping^*; Wang, Lihua^*; Liu, Haiping^*

来源：Vacuum, 2023, 215: 112281.

DOI：10.1016/j.vacuum.2023.112281

• beta titanium
• TNTZO
• Selective laser melting (SLM)
• Mechanical property
• Deformation mechanism

In this study, a high-dense multi-functional gum metal Ti36Nb2Ta2.7Zr0.3O (mass%, TNTZO) alloy was successfully produced using selective laser melting (SLM). The as-built components exhibited epitaxially grown beta grains with a slight deviation from the building direction, resulting in a cubic-like texture where (001)beta was oriented along the building direction. Additionally, nanoscale. precipitates were found embedded in the beta matrix. The uniaxial tensile tests revealed that the as-built TNTZO alloy had repeatable strength with a yield strength of 756 MPa. Dislocation slip was the dominant mechanism responsible for the deformation of the as-built TNTZO alloy, with no phase transformation or deformation twin observed. The interaction between the. variants with the dislocations during plastic deformation led to the formation of "omega-free channels" due to the different orientation relationship of omega variants with beta matrix. The post-mortem analysis revealed that ductile fracture is the dominant fracture mode.

• 单位
  上海交通大学