论文部分内容阅读
采用普通铜模浇铸法制备出厚度为3mm的Mg65Cu25Y10块体非晶合金试样,并在室温(22℃)、120和160℃下分别对试样采用频率为20kHz的功率超声处理不同时间2、5和10min使其晶化。超声处理后的试样采用XRD分析其晶化程度;在扫描电子显微镜(SEM)下观察到较小弥散分布的晶体相颗粒和较大羽毛状颗粒。EDS图谱显示较小颗粒为Mg2Cu,较大羽毛状颗粒成份接近母合金。SEM照片显示随超声处理时间的延长,非晶基体上的晶体相增多,且尺寸增大;较大羽毛状颗粒数量增多,尺寸增大。维氏硬度(Hv)也随超声处理时间的延长而增大。
The specimens of Mg65Cu25Y10 bulk amorphous alloy with a thickness of 3mm were prepared by ordinary copper mold casting method and the samples were sonicated at different frequencies of 20kHz at room temperature (22 ℃), 120 and 160 ℃ respectively, 5 and 10min to crystallize. The sonicated samples were analyzed for their degree of crystallinity by XRD; smaller dispersed particles of crystal phase and larger feather particles were observed under a scanning electron microscope (SEM). The EDS pattern shows that the smaller particles are Mg2Cu and the larger feather-like particles are closer to the mother alloy. The SEM images show that with the prolongation of the sonication time, the number of crystal phases on the amorphous matrix increases and the size increases; the number of larger feathered particles increases and the size increases. Vickers hardness (Hv) also increased with the extension of sonication time.