(1. 南昌大学 机电工程学院，南昌330031；2. 南昌大学 材料科学与工程学院，南昌330031)
摘 要: 基于大块非晶在过冷液相区间具有较好的热塑性成形特点，选择铜基非晶Cu40Zr44Ag8Al8和铜合金，通过挤压成形工艺，制备出一种新型的铜合金/非晶复合材料；在703 K和挤压速度为0.4 mm/min下对该复合材料进行挤压，获得铜合金/非晶复合材料棒材。通过光学金相(OM)、X射线衍射(XRD)、示差扫描量热分析(DSC)和维氏硬度测试(HV)对挤压变形前、后芯部非晶进行形貌观察和结构分析。结果表明：芯部非晶在挤压前期呈不均匀分布，而后分布非常均匀；结合XRD、DSC和硬度的结果分析，在703 K下挤压后，芯部非晶没有发生晶化。
关键字: 铜基非晶；热塑性成形；复合材料；晶化；过冷液相区间
novel Cu alloy/bulk metallic glass composite
（1. School of Mechatronics Engineering, Nanchang University, Nanchang 330031, China;
2. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, China）
Abstract:A novel Cu alloy/bulk metallic glass (BMG) composite was fabricated through the coextrusion process, based on the excellent thermoplastic forming characteristics of BMG in the supercooled liquid region (SLR). The Cu-based amorphous Cu40Zr44Ag8Al8 and pure Cu alloy were selected as components. The Cu alloy/BMG composite bar was easily fabricated at extrusion temperature of 703 K and extrusion speed of 0.4 mm/min. The morphology and structure of the core BMG before and after the coextrusion with Cu were characterized by optical microscopy (OM), X-ray diffractometry (XRD), differential scanning calorimetry(DSC) and microhardness(HV). The results indicate that the core BMG can reach the approximately uniform distribution of the dimension after suffering the shortly inhomogeneous distribution of the dimension in the initial stages of coextrusion. Combining the analysis of XRD, DSC and micro hardness (HV), it can be concluded that the crystallization of core BMG does not occur after the coextrusion with Cu at 703 K.
Key words: Cu-based bulk metallic glass; thermoplastic forming; composite; crystallization; supercooled liquid region
