Combined effect of isothermal annealing and pre-compression on mechanical properties of Cu_(36)Zr_(48)Al_8Ag_8 bulk metallic glass  

等温退火和预压处理对Cu_(36)Zr_(48)Al_8Ag_8大块非晶合金力学性能的共同影响（英文）

作　　者：顾及 张立鑫[1] 王依涵[1] 倪颂[1] 郭胜锋[2] 宋旼[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083 [2]西南大学材料与能源学院,重庆400715

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第6期1620-1628,共9页中国有色金属学报（英文版）

基　　金：Projects(51328101,51301142)supported by the National Natural Science Foundation of China;Project(2015JJ2206)supported by Hunan Provincial Natural Science Foundation of China

摘　　要：The combined effects of isothermal annealing and pre-compression on the mechanical properties of Cu36Zr48Al8Ag8 bulk metallic glass （BMG） were investigated. The as-cast specimens were first annealed at 743 K for 10 min, and then pre-compressed under 800 MPa for 1, 3, 5 and 10 h, respectively. The results indicated that annealing resulted in the formation of nanocrystals with a diameter of -10 nm in the amorphous matrix and a drastic decrease of the free volume, leading to complete loss of the plasticity of the BMG. Applying pre-compression under a stress of 800 MPa for a proper duration （5 h） resumed part of the lost free volume in the BMG matrix and therefore partially recovered the plasticity. A very long period of pre-compression （10 h） decreased the free volume again, which was caused by the excessive crystal growth.研究等温退火和预压处理对Cu_(36)Zr_(48)Al_8Ag_8大块非晶合金力学性能的共同影响。首先,将铸态样品在743 K退火10 min,然后对退火后的样品进行预压处理,在800 MPa压力下分别预压1、3、5和10 h。结果表明,退火处理后在非晶基体中形成了尺寸为10 nm左右的纳米晶并极大地湮灭了自由体积,从而导致大块非晶合金完全丧失塑性。在800 MPa下预压处理合适的时间(5 h)可以部分地恢复自由体积,进而部分地恢复大块非晶合金的塑性。而过长的预压时间(10 h)将导致自由体积的再次减小,主要源于纳米晶的过分长大。

关 键 词：bulk metallic glasses ANNEALING pre-compression free volume nanocrystal 

分 类 号：TG139.8[一般工业技术—材料科学与工程] TG156.2[金属学及工艺—合金]