【目的】旨在解决水下装备用TC4钛合金在传统锻造与铸造工艺中存在的问题,探究激光送粉增材制造(Laser metal deposition,LMD)技术制备该合金的可行性,为深海装备选材提供依据。【方法】采用LMD技术制备TC4钛合金,分析其微观组织特征,...【目的】旨在解决水下装备用TC4钛合金在传统锻造与铸造工艺中存在的问题,探究激光送粉增材制造(Laser metal deposition,LMD)技术制备该合金的可行性,为深海装备选材提供依据。【方法】采用LMD技术制备TC4钛合金,分析其微观组织特征,通过纳米压痕、拉伸试验及冲击试验测试力学性能,并与传统轧制态TC4进行对比。【结果】LMD制备的TC4组织结构特征为板条状α'马氏体组织,与轧制态TC4等轴晶粒差异显著,β相含量极低。LMD制备的TC4合金纳米硬度达6.65 GPa,远高于轧制态的1.54 GPa,抗拉强度为1059.4 MPa,断后伸长率为10.6%,冲击韧性为43 J,虽然略低于轧制态的59.5 J,但符合国家标准。【结论】LMD制备的TC4钛合金力学性能满足深海装备严苛要求,部分关键性能优于传统材料,对推动深海装备技术发展具有重要意义。展开更多
The incorporation of 2 wt.% silver(Ag)nanoparticles into TC4-ELI titanium alloy via electrostatic assembly was investigated,followed by laser powder bed fusion additive manufacturing.The objective was to enhance the a...The incorporation of 2 wt.% silver(Ag)nanoparticles into TC4-ELI titanium alloy via electrostatic assembly was investigated,followed by laser powder bed fusion additive manufacturing.The objective was to enhance the alloy’s mechanical properties,corrosion resistance,and antibacterial performance to test its potential application in body implants.The results show that electrostatically assembled TC4-ELI/Ag samples achieve a relative density of 99.5%,an ultimate tensile strength of 1250.3 MPa,and an elongation of 16.13%,significantly surpassing unmodified TC4-ELI and ball-milled TC4-ELI/Ag samples.The electrochemical analysis confirms enhanced corrosion resistance,with TAM3 samples(electrostatically assembled)exhibiting superior passivation and a lower corrosion current density of 0.239μA/cm².Antibacterial tests demonstrate the best performance for TAM3,with a marked reduction in bacterial growth attributed to the uniform dispersion and controlled release of Ag ions.展开更多
基金support of the Interdisciplinary Program of Shanghai Jiao Tong University,China(No.YG2022QN052)the National Natural Science Foundation of China(No.51975346).
摘要The incorporation of 2 wt.% silver(Ag)nanoparticles into TC4-ELI titanium alloy via electrostatic assembly was investigated,followed by laser powder bed fusion additive manufacturing.The objective was to enhance the alloy’s mechanical properties,corrosion resistance,and antibacterial performance to test its potential application in body implants.The results show that electrostatically assembled TC4-ELI/Ag samples achieve a relative density of 99.5%,an ultimate tensile strength of 1250.3 MPa,and an elongation of 16.13%,significantly surpassing unmodified TC4-ELI and ball-milled TC4-ELI/Ag samples.The electrochemical analysis confirms enhanced corrosion resistance,with TAM3 samples(electrostatically assembled)exhibiting superior passivation and a lower corrosion current density of 0.239μA/cm².Antibacterial tests demonstrate the best performance for TAM3,with a marked reduction in bacterial growth attributed to the uniform dispersion and controlled release of Ag ions.