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利用铜模吸铸法制备了直径分别为3、4和6 mm的阶梯型Zr60Al10Cu30棒状试样,采用X射线衍射、扫描电镜和万能试验机等研究了所制备合金的玻璃形成能力(GFA)和力学性能。结果表明,Zr60Al10Cu30合金的非晶临界尺寸接近6 mm,具有较强的玻璃形成能力。其中全非晶结构的Ф4 mm合金块体金属玻璃的抗压强度、塑性应变分别为1 595 MPa和1.95%,断口呈现非晶典型的脉状纹络和脆性平滑区。在Ф6 mm处的原位生成晶体/非晶基复合材料中,新析出DO3结构的AlCu2Zr晶体相和Cu10Zr7共晶正交晶体相,增加了合金的脆性,最终断裂行为取决于塑性相和脆性相之间的竞争,致使其抗压强度和塑性应变分别为1 345 MPa和0.5%。
The as-prepared Zr60Al10Cu30 steels with diameters of 3, 4 and 6 mm were prepared by copper mold suction casting. The glass forming ability (GFA) and the wear resistance of the prepared alloys were investigated by X-ray diffraction, scanning electron microscopy and universal testing machine. Mechanical properties. The results show that the critical grain size of Zr60Al10Cu30 alloy is close to 6 mm, which shows a strong glass forming ability. The compressive strength and plastic strain of the Ф4 mm alloy bulk metallic glass with all-amorphous structure are respectively 1 595 MPa and 1.95%. The fracture shows amorphous typical veins and brittle smoothing zone. In Ф6 mm in-situ crystal / amorphous composites, the newly precipitated DO3 AlCu2Zr crystal phase and Cu10Zr7 eutectic orthorhombic crystal phase increase the brittleness of the alloy, and the final fracture behavior depends on the plastic and brittle phases The resulting competition between compressive strength and plastic strain was 1 345 MPa and 0.5%, respectively.