中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 8 August 2025 |
（1. School of Mechanical Engineering, Sichuan University, Chengdu 610065, China;
2. Sichuan Advanced Metal Material Additive Manufacturing Engineering Technology Research Center,
Chengdu Advanced Metal Materials Industry Technology Research Institute Co., Ltd., Chengdu 610300, China;
3. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,
Pangang Group Research Institute Co., Ltd., Panzhihua 617000, China）
Abstract:The effect of electro-pulsing treatment (EPT) with different peak current densities (Jm) on tensile properties of selective laser melting (SLM)-produced TC4 alloy was investigated for significant improvement in the tensile properties of the alloy. When Jm is 30 A/mm2, the elongation is improved distinctly by 19.72% while the ultimate tensile strength remains nearly constant. The improved ductility is evidenced by deeper dimples on the fracture surface and cracks from the shear lip zone. Additionally, the improvement is reflected by widely distributed voids and prominent slip bands in the longitudinal section of the fracture. The fracture behavior is attributed to the increased high-angle grain boundaries fraction and the reduced dislocation density induced by the appropriate EPT. This microstructure leads to a decrease in texture intensity of the basal plane and an enhancement in crystalline slip capacity of the plane, consequently, the improved plastic deformation capacity of the alloy.
Key words: electro-pulsing treatment; SLM-produced TC4 alloy; tensile properties; fracture behavior; microstructure
