摘要
对超声法制备的SiCp/AZ61镁基复合材料进行时效研究,结果表明:在时效过程中析出的第二相经XRD分析为Mg17Al12,且第二相的脱溶方式为连续脱溶与不连续脱溶两种方式同时存在,与基体相比,SiCp/AZ61镁基复合材料在时效时的孕育期要长,且在过时效期显微硬度下降要慢。试样经420℃固溶10 h后,硬度值为66.5 HV,再经250℃时效,最佳的时效时间为10 h,硬度达到81.5 HV,与基体相比,硬度提高54%。
The ageing treatment of SiCp/AZ61 magnesium matrix composite fabricated by ultrasonic stirring was studied. The results show that the secondary precipitation phase during ageing is Mg17 Al12, and the secondary phase is precipitated in continuous and discontinious precipitation ways. Compared with AZ61 magnesium alloy, the incubation period of its ageing is longer, and the microhardness decreases slowly during over-aging. The microhardness of SiCp/AZ61 magnesium matrix composite is 66.5 HB after solution treatment at 420 ℃ for 10 h. The highest microhardness of 81.5 HB can be obtained after ageing at 250℃ for 10 h. Compared with AZ61 magnesium alloy, the microhardness increases by 54 %.
出处
《铸造技术》
CAS
北大核心
2009年第2期177-180,共4页
Foundry Technology
基金
国家自然科学基金(50765005)
江西省自然科学基金(2007GZC1826)
江西省教育厅资助项目
