變形行為
(1. 湘潭大學(xué) 材料與光電物理學(xué)院，湘潭 411105；
2. 湘潭大學(xué) 材料設(shè)計(jì)與制備技術(shù)湖南省重點(diǎn)實(shí)驗(yàn)室，湘潭 411105；
3. 湘潭大學(xué) 能源工程學(xué)院，湘潭 411100；
4. 湘潭大學(xué) 土木工程與力學(xué)學(xué)院，湘潭 411105)
摘 要: 利用納米壓痕技術(shù)研究直徑為3 mm的{[(Fe0.6Co0.4)0.75B0.2Si0.05]0.96Nb0.04}96Cr4塊體非晶合金的變形行為以及加載速率對(duì)其塑性變形行為的影響規(guī)律。結(jié)果表明：該塊體非晶合金在低加載速率下表現(xiàn)出顯著的鋸齒流變，而在高的加載速率下表現(xiàn)為連續(xù)的塑性變形；在納米壓痕過程中，該塊體非晶合金出現(xiàn)室溫蠕變現(xiàn)象，且其硬度值隨著加載速率的增大而減小。
關(guān)鍵字: 塊體非晶合金；納米壓痕；鋸齒流變；蠕變
（1. Faculty of Materials Optoelectronics and Physics, Xiangtan University, Xiangtan 411105, China;
2. Key Laboratory of Materials Design and Preparation Technology of Hunan Province,
Xiangtan University, Xiangtan 411105, China;
3. College of Energy Engineering, Xiangtan University, Xiangtan 411100, China;
4. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China）
Abstract:The deformation behaviour of {[(Fe0.6Co0.4)0.75B0.2Si0.05]0.96Nb0.04}96Cr4 bulk amorphous alloy with a diameter of 3 mm and the influence of loading rate on its plastic deformation were investigated by the technique of nanoindentation. The results show that the {[(Fe0.6Co0.4)0.75B0.2Si0.05]0.96Nb0.04}96Cr4 bulk amorphous alloy exhibits prominent serrated flow at low loading rate while the plastic deformation is continuous at high loading rate. During nanoindentation, the room temperature creep of the {[(Fe0.6Co0.4)0.75B0.2Si0.05]0.96Nb0.04}96Cr4 bulk amorphous alloy is observed, and its hardness decreases with the increase of loading rate.
Key words: bulk amorphous alloy; nanoindentation; serrated flow; creep
