医用材料Mg-Y-Nd-Zr合金的组织及力学性能  

Microstructure and mechanical properties of Mg-Y-Nd-Zr alloys for biomedical materials

作　　者：丁雨田[1] 于善坤[1] 胡勇[1] 方元[1] 李畅[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料重点实验室,甘肃兰州730050

出　　处：《兰州理工大学学报》2010年第1期20-23,共4页Journal of Lanzhou University of Technology

基　　金：兰州理工大学博士基金(SB01200606)的资助

摘　　要：采用电阻炉和316L不锈钢坩埚，在RJ-2覆盖剂的保护下制备4种不同质量分数钕（Nd）的Mg-Y-Nd-Zr合金．采用电子探针、X射线衍射分析、拉伸测试、扫描电镜等方法研究4种合金的组织及力学性能．结果表明．Mg—Y—Zr合金主要由α-Mg和Mg24Y5相组成，加入Nd后，形成了新相Mg12Nd；Mg-Y-Nd-Zr合金断口具有准解理和韧性断裂的混合特征，其力学性能因Nd的质量分数不同而变化，弹性模量为25．8～35．8GPa，接近人体骨的模量，可满足医疗器械及用于心脏介入治疗生物可降解材料力学相客性要求．4 types of Mg-Y-Nd-Zr alloys with different mass-fractions of Nd were prepared in 316L stainless steel crucible of resistance furnace under the protection of solvent RJ-2. X-ray diffraction, electron probe micro-analysis, tensile tests, and scanning electron microscopy were carried out to investigate the microstruetures and mechanical properties of these alloys. The result showed that the Mg-Y-Zr alloy consisted mainly of α-Mg and Mg24 Y5, and it would generate a new Mg12 Nd strengthening phases after addition of Nd element. The fractured section of Mg-Y-Nd-Zr alloys exhibited mixed character such as quasicleavage and ductile fracture and its microstructure changed with the mass-fractions of added Nd, resulting in changes in mechanical properties of the alloys, the modulus of elasticity was between 25. 8 GPa and 35.8 GPa, which was close to that of human bone, indicating that these alloys could satisfy the requirement of biomeehanical compatibility necessary for medical instrument and biodegradable materials in cardiac interventional therapy.

关 键 词：稀土镁合金 显微组织 强化相 生物力学相容性 断裂 

分 类 号：TB34[一般工业技术—材料科学与工程] TG146.2[金属学及工艺—金属材料]