采用悬浮熔炼-铜模吸铸法制备了Cu50Zr42Al8块体金属玻璃,研究了其楔形试样的组织演变.随着熔体凝固过程中冷却速度的变化,楔形试样中存在表面全非晶区,中心晶体区以及二者之间的过渡区域,并确定Cu50Zr42Al8块体金属玻璃临界尺寸为4.8 mm.分别考察了φ4 mm铸态完全非晶棒和φ5 mm非晶复合棒的力学性能.φ4 mm非晶棒的压缩断裂强度,弹性应变和塑性应变分别为2260 MPa,2.0%,0.4%,几乎没有塑性变形.而φ5 mm铸态非晶复合棒的屈服强度、断裂强度分别为1670MPa、1849 MPa,弹性应变和塑性应变分别为1.6%和1.9%.非晶基体中存在的马氏体相CuZr和正交晶相Cu10Zr7的竞争影响了非晶复合棒的最终力学行为.
Cu50Zr42Al8 bulk metallic glass (BMG) was prepared and microstructure of Cu50Zr42Al8 tapered sample was characterized by means of X-ray diffraction,differential scanning calorimetry and optical microscopy.The relative dimension of surface amorphous region,center crystal region and transition region between the two regions on different section of the tapered sample is strongly determinated by the cooling rate of solidification.The critical diameter of the bulk glassy alloy Cu50Zr42Al8 is up to 4.8 mm.The φ4 mm BMG exhibits high compressive fracture strength of 2260 MPa with elastic srtain of 2.0% and plastic strain of 0.4%.The mechanical properties of Cu50Zr42Al8 bulk metallic glass and its composite containing CuZr and Cu10Zr7 crystalline phases were also discussed.The φ5 mm BMG composite exhibits a combination of high compressive fracture strength (1849 MPa) and yielding strength (1670 MPa) with elastic strain of 1.6%and plastic strain of 1.9% ,the final fracture behavior of the glass is controlled by competition of the two crystallizing phases.
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