Microstructures and mechanical properties of Mg�?�Zn�?�Zr�?�Dy wrought magnesium alloys

Bulletin of materials science

J Xu³  K H Zheng³  Z H Huang²  M Liu³  X M Zhang¹  W J Qi³  Z M Yu¹ 

[1] School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China$$School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. ChinaSchool of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China$$;Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, P.R. China$$School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China$$Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, P.R. ChinaGuangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, P.R. China$$School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China$$School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. ChinaGuangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, P.R. China$$School of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China$$;Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, P.R. China$$Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, P.R. ChinaGuangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, P.R. China$$

关键词: Wrought magnesium alloys;    microstructure;    mechanical property;    extrusion.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Microstructures and phase compositions of as-cast and extruded ZK60â€�?�ð�?�¥Dy (ð‘�? = 0â€�??5) alloys were analysed by optical microscope, scanning electron microscope, X-ray diffraction and differential scanning calorimetry. Meanwhile, the tensile mechanical property was tested.With increasing Dy content, Mgâ€�?�Znâ€�?�Dy new phase increases gradually, while MgZn₂ phase decreases gradually to disappear. As-cast microstructure is refined gradually; meanwhile extruded one is refined further with decreasing average grain size to 1 𝜇m for ZK60â€�??4.32Dy alloy. Second phase, tending to distribute along grain boundary by continuous network in as-cast state, breaks and distributes dispersedly in extrusion state. As-cast tensile mechanical property remains almost unchanged at ambient temperature; however, extruded ones are enhanced significantly at ambient and elevated temperatures, respectively. Tensile strength at 298 and 473 K increases gradually from 355 and 120 MPa for ZK60 alloy to 395 and 171 MPa for ZK60â€�??4.32Dy alloy, respectively. Extruded tensile fractures exhibit a typical character of ductile fracture.

【 授权许可】

Unknown