东南大学学报（自然科学版）2012，Vol.42Issue(3)：478-482,5.DOI:10.3969/j.issn.1001-0505.2012.03.016
长周期堆垛有序结构强化Mg-Zn-Y合金的组织与性能
Microstructure and properties of Mg-Zn-Y alloys with long period stacking ordered structure
刘欢 1薛烽 1白晶1
作者信息
- 1. 东南大学材料科学与工程学院,南京211189
- 折叠
摘要
Abstract
In order to study the effects of long period stacking ordered (LPSO) structure on micro-structure and mechanical properties of Mg-Zn-Y wrought alloys, Mg97Zn1Y2 and Mg94Zn2Y4 alloys were fabricated by casting and hot extrusion. Morphology and tensile properties of the alloys in the as-cast, annealed, and extruded stage were investigated by scanning electronic microscopy (SEM), transmission electronic microscopy (TEM) and electronic universal testing machine. The results show that the two as-cast alloys are composed of ot-Mg and 18R-LPSO phase, and the LPSO phase forms a network at Mg grain boundaries. Annealed at 500 t for 36 h, a section of block-shaped 18R-LPSO phase is transformed into lamellar 14H-LPSO structure in Mg97Zn1Y2 alloy, but no remarkable changes are observed in Mg94Zn2Y4 alloy. After extrusion, LPSO phase is aligned along the direction of extruding and the strength of the alloys is promoted significantly. The tensile strength reaches 319 and 390 Mpa for Mg97Zn1 Y2 and Mg94Zn2Y4 alloys, respectively.关键词
长周期堆垛有序结构/铸造/退火/挤压Key words
long period stacking ordered stucture/ casting/ annealing/ extruding分类
矿业与冶金引用本文复制引用
刘欢,薛烽,白晶..长周期堆垛有序结构强化Mg-Zn-Y合金的组织与性能[J].东南大学学报（自然科学版）,2012,42(3):478-482,5.
