材料科学
非晶态金属
过冷
应变率
变形(气象学)
差示扫描量热法
结晶
无定形固体
合金
复合材料
活化能
玻璃化转变
热力学
大气温度范围
铸造
冶金
结晶学
化学
物理
有机化学
聚合物
作者
Weijian Zhang,Pengcheng Tao,Yugan Chen,Junfeng Si,Kunsen Zhu,Zhenghua Huang,Yuanzheng Yang
标识
DOI:10.1016/j.jallcom.2022.164450
摘要
Zr55.7Cu22.4Ni7.2Al14.7 alloy rods with a diameter of 3 mm were prepared by copper mold suction casting. The structure, thermodynamic properties and plastic deformation behavior of the specimens before and after compression in supercooled liquid region were studied by X-ray diffractometer (XRD), differential scanning calorimeter (DSC) and uniaxial compression machine (equipped with a high-temperature oven). The range of thermal forming process parameters was also discussed. The results show that the alloys have obvious glass transition and crystallization kinetics, and the crystallization activation energies obtained by the Kissinger and Ozawa equations are 297.1 kJ/mol and 294.9 kJ/mol, respectively. The amorphous alloys exhibit stress overshoot in low temperature region at high strain rates and deformation behavior of alloy softening in high temperature region at medium to high strain rates. Meanwhile, the viscosity of the alloy remains approximately constant at 740 K and 750 K, showing Newtonian fluid characteristic. It can be concluded that the optimal thermoplastic forming process ranges from 740 K to 750 K, 5 × 10−4 s−1 to 5 × 10−3 s−1. The crystallization activation energies of the specimens after deformation are slightly higher than before, and they increase with the increase of strain rate.
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