(1. 東北大學(xué) 材料與冶金學(xué)院， 沈陽 110004；
2. 中國科學(xué)院 金屬研究所， 沈陽 110016;
3. 遼寧工學(xué)院 材料與化學(xué)學(xué)院， 錦州 121001)
摘 要: 利用納米壓痕儀、 掃描電鏡等研究了Zr基大塊非晶合金在納米壓痕條件下的變形及力學(xué)性能。 Zr基大塊非晶合金在納米壓頭作用下以彈性-塑性方式變形， 載荷—位移曲線及壓痕周邊多重剪切帶（堆起或波紋狀）的特征證明了塑性變形的存在。 冷卻速度、 第二相及退火等因素影響非晶合金的壓痕硬度HV和彈性模量E， 冷卻速度小的試樣或部位（如試樣中心）的HV， E值略高； 離第二相（W絲）越近， HV， E值越高； 退火處理提高非晶的HV， E值， 同時退火與第二相還明顯改變壓痕周邊的變形狀態(tài)及塑性變形量的大小， 退火顯著減小塑性變形量， 使壓痕周邊凹陷， 而第二相使壓痕堆起消失。對塑性變形機理進行了初步分析。
關(guān)鍵字: Zr基大塊非晶合金； 納米壓痕； 變形； 力學(xué)性能
YANG Hong-cai1, HU Zhuang-qi2
（1. College of Materials and Metallurgy,
Northeastern University, Shenyang 110004, China;
2. Shenyang National Laboratory for Materials Science,
Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China;
3. College of Materials and Chemistry,
Liaoning Institute of Technology, Jinzhou 121001, China）
Abstract:Deformation and mechanical properties of Zr-based bulk metallic glasses (BMGs) under nanoindenter and their affecting factors were studied by means of nanoindentation instrument and scanning electron microscope (SEM). The results indicate that Zr-based BMGs deform in an elastic-plastic mode under a nanoindenter. Load—displacement curve, multiple shear bands and ripple shape around a nanoindenter confirm the existence of a amount of plastic deformation. For pure quenched Zr-based BMGs, the larger the size of samples or the nearer the location away from the surface of a same sample, the smaller the values of microhardness and elastic modulus; annealing and tungsten fiber addition both enhance the values of HV and E, and significantly change the morphology around a nanoindenter and the amount of plastic deformation. The mechanism of plastic deformation is preliminarily analyzed.
Key words: Zr-based bulk metallic glass; nanoindention; deformation; mechanical property
