(南昌大學 江西省高性能精確成形重點實驗室，南昌 330031)
摘 要: 采用擠壓成形工藝制備新型純銅/Cu40Zr44Ag8Al8非晶復合板材。通過光學顯微鏡(OM)、X射線衍射 (XRD)、維氏硬度(HV)和掃描電子顯微鏡(SEM)研究復合板材芯部非晶尺寸與硬度的分布及復合板材的界面性能；并對比純銅板材和復合板材的三點彎曲性能。結果表明：通過擠壓成形工藝可以使復合板材獲得良好的界面結合，界面元素梯度分布表明界面寬度約為2.15 μm。擠壓開始階段，復合板材由單一純銅組成；隨后芯部開始出現(xiàn)非晶，且在距離頭部12 mm處非晶尺寸達到最大，其長度和寬度分別為2.785和1.481 mm；隨著擠壓的繼續(xù)進行，芯部的非晶尺寸逐漸減小并趨于穩(wěn)定，穩(wěn)定階段長度和寬度的平均尺寸分別為2.269和0.797 mm。X射線衍射和維氏硬度結果表明，芯部非晶在復合擠壓過程中沒有發(fā)生晶化現(xiàn)象。三點彎曲試驗表明，復合板材的彎曲強度比純銅的大，其彎曲斷裂強度為377.4 MPa。
關鍵字: 非晶合金；復合材料；熱塑性成形；彎曲性能
（Key Laboratory of Near Net Forming of Jiangxi Province, Nanchang University, Nanchang 330031, China）
Abstract:The novel pure copper/Cu40Zr44Ag8Al8 amorphous composite plate was fabricated by the extrusion process. The core and interface of composite plate were characterized by optical microscopy (OM), X-ray diffractometry (XRD), microhardness (HV) and scanning electron microscopy (SEM). The bending properties of pure copper plate and composite plate were investigated by three point bending test. The results indicate that a good bonding interface of composite plate is obtained with an interface width of about 2.15 μm through EDS analysis. The composite plate is composed of single pure copper at the start of extrusion. Then, the core begins to appear amorphous, and reaches the maximum value at the distance of about 12 mm to head of plate. The length and width are 2.785 and 1.481 mm, respectively. The dimension of BMG core reduces gradually and then becomes stable. The average size of the length and width are 2.269 and 0.797 mm, respectively. The crystallization of amorphous in the core during extrusion does not occur through the analysis of XRD and microhardness. Three point bending test show that the composite plate exhibits a larger bending flexural strength (of about 377.4 MPa) than the pure copper.
Key words: amorphous alloy; composite; thermoplastic forming; bending property
