摘要
采用直接激光沉积法(DLD)制备了工业纯Ti(CP-Ti)与TNTZO合金复合的Ti/TNTZO层状材料,对其微观组织、相组成、力学性能以及体外生物活性进行了分析。结果表明,通过DLD工艺可制备高致密度、无裂纹的Ti/TNTZO层状材料。所制备的层状材料主要由α/α'与β2相组成。层状材料的Ti层由于合金元素扩散及较快的凝固速率使其组织细化,硬度明显升高;TNTZO层因β稳定元素稀释,亚晶界处产生了大量马氏体,硬度增加。单向拉伸实验结果表明,Ti/TNTZO层状梯度材料具有远高于成分材料CP-Ti和TNTZO的拉伸屈服强度与抗拉强度,但界面处产生的大量马氏体导致了材料塑性降低。对Ti/TNTZO层状材料进行模拟体液浸泡,结果显示,Ti/TNTZO层状材料浸泡过程中未产生明显的腐蚀,且可有效诱导磷灰石的形核与长大,在人体植入物领域具有很好的应用前景。
Commercially pure titanium(CP-Ti)is a human-implant metal material commonly used for cardiovascular scaffolds and dental implants in the medical field.This is because CP-Ti has better biocompatibility and corrosion resistance compared to other alloys such as titanium-aluminum-vanadium alloy(Ti-6Al-4V).However,the low strength properties of CP-Ti have limited its wider application(e.g.,load-bearing components).On the contrary,Novelβtitanium alloys possess higher strength and lower elastic modulus,which has led to the consideration of Ti-Nb based alloys for biomedical applications,while also taking into consideration their biocompatibility and other mechanical properties.Recently,laminated metal composites(LMCs)have attracted a lot of attention due to the excellent properties of the constituent alloys.Direct laser deposition(DLD)is an additive manufacturing technology that can be poten-tially used to manufacture LMCs.In this work,the DLD process was used to manufacture Ti/TNTZO LMC,and CP-Ti and TNTZO alloy powders were the raw materials.Subsequently,the microstructure,phase composition,mechanical properties,and in vitro bioactivity of the Ti/TNTZO LMCs were analyzed.The results demonstrated that high-density,crack-free Ti/TNTZO can be fabricated using the DLD process.Ti/TNTZO is mainly composed ofα/α'andβphases.Transmitted Kikuchi diffraction maps showed the presence ofα"martensite,but due to its low content,there were no relevant peaks in the X-ray powder diffraction spectra.The hardness of the Ti region in the Ti/TNTZO increased due to the diffusion of alloy elements and refinement of the structure formed as a result of a faster cooling rate.However,for the TNTZO region,the hardness also increased due to the martensite transformation caused by the dilution ofβ-stabilizing elements compared with the TNTZO manufactured using the DLD process.In comparison with the CP-Ti and TNTZO made using the DLD process,the microstructure of the Ti/TNTZO multilayered materials was significantly different.The microstructure
作者
张婷
李仲杰
许浩
董安平
杜大帆
邢辉
汪东红
孙宝德
ZHANG Ting;LI Zhongjie;XU Hao;DONG Anping;DU Dafan;XING Hui;WANG Donghong;SUN Baode(Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第6期757-766,共10页
Acta Metallurgica Sinica
基金
国家自然科学基金项目Nos.51871152、U1760110和51831011。
