摘要
为了研究孔隙率、支杆直径等结构参数对多孔Ti6Al4V(Extra-low interstitial,ELI)合金拉伸性能的影响,本实验采用选区激光熔化的方法成形了正八面结构的多孔Ti6Al4V(ELI)合金,在室温下对不同结构参数的多孔Ti6Al4V(ELI)合金进行了拉伸试验,并利用扫描电镜观察合金的断口形貌以分析其拉伸断裂机制。结果表明:在相同孔隙率下,随着支杆直径的增大,多孔结构的抗拉强度和延伸率都明显升高;当支杆直径相近时,孔隙率的升高则会导致多孔结构的抗拉强度和延伸率下降;拉伸断口存在大量的解理台阶和少量的韧窝,表明正八面体多孔Ti6Al4V(ELI)合金的拉伸断裂机制为脆性和韧性断裂。
In order to investigate the influence of structural parameters such as porosity and strut diameter on the tensile properties of porous Ti6Al4V(ELI)alloy,octahedral porous Ti6Al4V(ELI)alloy was precisely fabricated by selective laser melting.The tensile test of porous Ti6Al4V(ELI)alloy with different structural parameters was carried out at room temperature,the fracture morphology of the alloy was observed by scanning electron microscopy to reveal the failure mechanism in tension.Results show that tensile strength and elongation increase with the increase of strut thickness when the porosity is the same,while mechanical properties decrease with the increase of porosity when with similar strut thickness.The massive terraces and few dimples at the fracture surface indicate the brittle and ductile fracture mechanism of the SLM-ed Ti6Al4V(ELI)alloy.
作者
李卿
赵国瑞
马文有
余红雅
刘敏
LI Qing;ZHAO Guorui;MA Wenyou;YU Hongya;LIU Min(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China;Key Laboratory of Guangdong for Modern Surface Engineering Technology,National Engineering Laboratory for Modern Materials Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou 510650,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第4期73-76,共4页
Materials Reports
基金
广东省科学院实施创新驱动发展能力建设专项资金(2017GDASCX-0202
2017GDASCX-0111
2018GDASCX-0402
2018GDASCX-0946
2018GDASCX-0111)
广东省省级科技计划项目(2016A030312015
2017A070702016
2017B030314122
2017A070701027
2014B070705007)~~
