生物医用Zn-5Al合金的微观组织与性能

研究了生物医用Zn-5Al合金的微观组织结构演化，探讨了其组织对力学性能的影响.对铸态、均匀化处理和轧制态Zn-5Al合金的微观组织进行了表征，分析了合金的相组成，测试了轧制态Zn-5Al合金的力学性能.结果表明:铸态与均匀化处理后的Zn-5Al合金的相组成均主要为η-Zn相和α-Al相，铸态合金组织片层间距约为300nm.均匀化处理过程中发生了共析反应，合金中的α-Al相由铸态的长条形演变为球形共晶组织.经过总变形率85%的热轧变形后，Zn-5Al合金的屈服强度和抗拉强度分别为98MPa和130MPa，断裂延伸率达到74%.

Microstructure and Properties of Biomedical Zn-5Al Alloy

The phase selection and microstructural evolution of biodegradable biomedical Zn-5Al alloy were studied. The microstructure of as casting， after homogenization treatment and the rolled Zn-5Al alloy was characterized， respectively and the phase compositions of the Zn-5Al alloy was analyzed.Then the mechanical properties of the rolled Zn-5Al alloy were tested. The results showed that the phase compositions of the as casting Zn-5Al alloy and after homogenization treatment were mainly composed by the η-Zn phase and α-Al phase. The interlamellar spacing of the eutectic structure in the as casting Zn-5Al alloy was about 300nm.The eutectoid reaction occurred during the homogenization treatment and the α-Al phase of the Zn-5Al alloy was changed from the original strip shape to spherical eutectic structure after homogenization treatment. After rolling of 85% for a total deformation rate， the yield and tensile strength of the Zn-5Al alloy were 98MPa and 130MPa， respectively， and its fracture elongation reached 74%.