中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 23 No. 9 September 2013 |
(Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China)
Abstract:Microstructures and phase compositions of as-cast and extruded ZK60-xGd (x=0-4) alloys were investigated. Meanwhile, the tensile mechanical property was tested. With increasing the Gd content, as-cast microstructure is refined gradually. Mg-Zn-Gd new phase increases gradually, while MgZn2 phase decreases gradually to disappear. The second phase tends to distribute along grain boundary by continuous network. As-cast tensile mechanical property is reduced slightly at ambient temperature when the Gd content does not exceed 2.98%. After extrusion by extrusion ratio of 40 and extrusion temperature of 593 K, microstructure is refined further with decreasing the average grain size to 2 μm for ZK60-2.98Gd alloy. Broken second phase distributes along the extrusion direction by zonal shape. Extruded tensile mechanical property is enhanced significantly. Tensile strength values at 298 and 473 K increase gradually from 355 and 120 MPa for ZK60 alloy to 380 and 164 MPa for ZK60-2.98Gd alloy, respectively. Extruded tensile fractures exhibit a typical character of ductile fracture.
Key words: ZK60 magnesium alloy; Gd modification; extrusion; microstructure; mechanical property; fracture morphology