大块金属玻璃Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5)在玻璃转变区轧制行为的研究  

Rolling Behavior of Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) Bulk Metallic Glass in the Glass Transition Region

作　　者：王国明[1] 肖学山[1] 方守狮[1] 顾建忠[1] 董平华 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]武汉中铁工程机械厂,武汉430063

出　　处：《上海大学学报（自然科学版）》2004年第1期1-4,共4页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金 (50 0 3 1 0 1 0和 50 2 0 1 0 0 9)资助项目

摘　　要：在玻璃转变区内对大块金属玻璃Zr41.2Ti13.8Cu12.5Ni10Be22.5以不同的轧制率(0%,12.5%,25%,37.5%和50%)进行轧制,用XRD、HRTEM、SEM、DSC和直流四探针法研究了轧制行为对其结构、表面形貌、热性能和相对电阻率的影响.研究结果表明,轧制后的试样仍然保持非晶相,但在非晶基体相中已经出现了一些有序团簇;第一晶化峰的起始温度降低,导致过冷液相区变窄,金属玻璃的热稳定性有下降的趋势;同时,随着轧制率的增加,室温表面相对电阻率表现为先上升、后下降的趋势.Samples of Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5) bulk metallic glass were rolled in the glass transition region at various roll reduction ratios. The effects of rolling on the structure, surface morphology, thermal stability and relative electrical resistivity were investigated by means of x-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), differential scanning calorimeter (DSC) and the four-probe method, respectively. It has been found that the samples still keep an amorphous phase after being rolled, but some order clusters appear in the amorphous matrix. The onset temperature of the first crystallization peak (T_(x1)) decreases with the rolled reduction ratios, resulting in reduction of the width of supercooled liquid region so that the thermal stability of amorphous alloys shows a decreasing tendency. In addition, the electrical resis-(tivity) of the samples at the room temperature increases initially, and then decreases.

关 键 词：轧制 金属玻璃 Zr41.2Ti13.8Cu12.5Ni10Be22.5 

分 类 号：TG139.8[一般工业技术—材料科学与工程]