(1. 南昌大學 機電工程學院，南昌330031；2. 南昌大學 材料科學與工程學院，南昌330031)
摘 要: 基于大塊非晶在過冷液相區(qū)間具有較好的熱塑性成形特點，選擇銅基非晶Cu40Zr44Ag8Al8和銅合金，通過擠壓成形工藝，制備出一種新型的銅合金/非晶復合材料；在703 K和擠壓速度為0.4 mm/min下對該復合材料進行擠壓，獲得銅合金/非晶復合材料棒材。通過光學金相(OM)、X射線衍射(XRD)、示差掃描量熱分析(DSC)和維氏硬度測試(HV)對擠壓變形前、后芯部非晶進行形貌觀察和結構分析。結果表明：芯部非晶在擠壓前期呈不均勻分布，而后分布非常均勻；結合XRD、DSC和硬度的結果分析，在703 K下擠壓后，芯部非晶沒有發(fā)生晶化。
關鍵字: 銅基非晶；熱塑性成形；復合材料；晶化；過冷液相區(qū)間
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
