【作者】 徐世伟； 郑明毅； 乔晓光； 甘为民； 吴昆；

【Author】 Xu Shiwei,Zheng Mingyi,Qiao Xiaoguang,Gan Weimin,Wu Kun (School of Material Science and engineering,Harbin Institute of Technology,Harbin 150001)

【机构】 哈尔滨工业大学材料科学与工程学院；

【摘要】 对挤压态Mg-Zn-Y-Zr合金进行ECAP（Equal channel angular pressing）变形,获得了细小原位准晶颗粒增强亚微米级镁基复合材料。随着ECAP变形道次的增加, Mg₃YZn₆准晶相破碎、细化,同时从基体中析出纳米尺寸的准晶相。经过8道次变形后,大部分基体合金晶粒已经细化到0.5μm左右。ECAP变形显著提高了材料的延伸率,变形8道次后达到了35%。但是,随着变形道次的增加,材料的屈服强度和抗拉强度却逐渐降低,这主要是由于在ECAP变形过程中,基体合金组织结构的变化所致。更多还原

【Abstract】 Equal channel angular pressing（ECAP） was performed on extruded Mg-Zn-YZr alloy containing quasicrystallines to obtain submicron Magnesium matrix composite reinforced by fine Mg₃YZn₆ particle.During ECAP,the quasicrystalline phases were broken and dispersed in the matrix and some nano-quasicrystallines precipitated from the matrix.After 8-pass ECAP,most of the grains were refined to about 0.5μm.After ECAP,the elongation to failure of the extruded material was effectively improved,after 8-pass ECAP it reached 35%.However,both yield strength and ultimate tensile strength were decreased with the increasing passes,which was considered to be resulted from the texture modification during ECAP.更多还原