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利用铜模铸造法获得了直径为2 mm的Ti35Zr30Be27.5Cu7.5块体非晶合金。采用X射线衍射(XRD)、扫描电镜(SEM)、差氏扫描量热仪(DSC)及压缩试验等方法研究了非晶合金的相结构、显微组织和热稳定性,以及热处理对其压缩强度及塑性的影响。结果表明:在553和583 K温度下分别保温5 h后,实验合金仍保持为非晶态;在613 K保温1 h后,有晶化相出现。Ti35Zr30Be27.5 Cu7.5非晶合金在583 K下保温1 h后其塑性变形量达到了6.57%,较热处理前提高了1倍,且保持了热处理前的强度,屈服强度和抗压强度分别为1921 MPa,2169 MPa。随着热处理温度的提高,非晶相含量减少,合金断裂强度、塑性变形量随之降低;同时合金断裂方式由韧性断裂转变为脆性断裂。
The Ti35Zr30Be27.5Cu7.5 bulk amorphous alloy with a diameter of 2 mm was obtained by copper mold casting. The phase structure, microstructure and thermal stability of amorphous alloys were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimeter (DSC) and compression test. The impact of strength and plasticity. The results show that the experimental alloys remain amorphous after being kept at 553 and 583 K for 5 h, respectively. After 1 h incubation at 613 K, the crystallized phases appear. The plastic deformation of Ti35Zr30Be27.5 Cu7.5 amorphous alloy after heat treatment at 583 K for 1 h reached 6.57%, which was 1 time higher than that before heat treatment, and maintained the strength before heat treatment. The yield strength and compressive strength of Ti35Zr30Be27.5 Cu7.5 alloy were 1921 MPa, 2169 MPa. With the increase of heat treatment temperature, the content of amorphous phase decreases, the fracture strength and the amount of plastic deformation decrease, and the fracture mode changes from ductile fracture to brittle fracture.