摘要
通过合金成分设计和铜模铸造开发出了不含高生物毒性元素Ni且具有高强度和良好室温塑性的Ti_(64)Cu_(25-x)Fe_(10)Si_1Nb_x(x=1,3,5,7;%,原子分数)树枝晶-超细晶结构复合材料,并研究了Nb元素含量对该系合金微观结构和力学性能的影响。研究结果表明, Ti_(64)Cu_(25-x)Fe_(10)Si_1Nb_x(x=1, 3, 5, 7)合金由β-Ti相、亚微米级CuTi_2和CuTi_3相组成。随着Nb元素含量的增加,合金中β-Ti相的体积分数增大,且当Nb含量为5%和7%时,β-Ti相呈枝晶状且分布较均匀。该系合金表现出高压缩断裂强度和硬度,分别为2125～2230 MPa和HV 505～520;压缩塑性应变为3.4%～14.3%,随着Nb含量的提高而增大。因此,通过Nb元素合金化能够有效调控Ti-Cu-Fe-Si-Nb系合金的相组成和力学性能,所开发的Ti-Cu-Fe-Si-Nb合金具有作为手术器械材料在生物医用领域应用的前景。
Ti64Cu25-xFe10Si1Nbx(x=1,3,5,7;%,atom fraction)dendrite-ultrafine grained composites free from biotoxic elements,exhibiting high strength and large plasticity at room temperature,were developed by composition design and copper mold casting.The influence of Nb content on microstructure and mechanical properties was investigated.It was found that the Ti64Cu25-xFe10Si1Nbx(x=1,3,5,7)alloys consisted ofβ-Ti phase,submicron CuTi2 phase and CuTi3 phase.With Nb contentincreasing,the volume fraction ofβ-Ti phase increased.When the Nb content was 5%and 7%,theβ-Ti phase presented as dendrite and distributed evenly.The Ti-based alloys exhibited high compressive strength and hardness,which were 2125~2230 MPa and HV 505~HV 520,respectively.The plastic strain of the alloys was 3.4%~14.3%,which increased with Nb content increasing.Therefore,it was effective to tailoring the phase constituent and mechanical properties through Nb alloying.The Ti-Cu-Fe-Si-Nb alloys were promising for surgical devices materials in biomedical application.
作者
王昊杰
刘滢
逄淑杰
张涛
Wang Haojie;Liu Ying;Pang Shujie;Zhang Tao(Key Laboratory of Aerospace Materials and Performance(Ministry of Education),School of Materials Science and Engineering,Beihang University,Beijing 100191,China;School of Physics and Nuclear Energy Engineering,Beihang University,Beijing 100191,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2019年第1期25-31,共7页
Chinese Journal of Rare Metals
基金
国家自然科学基金青年基金项目(51701008)
中国博士后科学基金项目(2017M620575)资助
关键词
钛合金
复合材料
微观结构
力学性能
titanium alloys
composite
microstructure
mechanical properties
