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用差示扫描量热仪分别对具有相似晶体体积分数和晶化激活能的Zr55Al10Ni5Cu30块体非晶合金铸态、轧制态试样进行等温和连续升温实验,研究了不同微观结构块体非晶合金的晶化过程。结果表明,在晶化初期(小于30 min),两个试样具有相似的晶化速率;晶化后期(大于30 min),轧制态试样表现出较快的晶化速率。这在一定程度上表明,用JMA公式和晶化开始温度Tx及峰值温度Tp计算出的晶化激活能不能全面反映非晶合金的热稳定性。另外,剪切带中原子之间相互联接的减弱以及短程有序的强化,使轧制态试样热稳定性降低和晶化过程变快。
The differential scanning calorimetry (DSC) experiment was carried out on the as-cast and rolled specimens of Zr55Al10Ni5Cu30 bulk amorphous alloy with similar crystal volume fraction and crystallization activation energy respectively. The effects of different temperature Alloy crystallization process. The results show that during the early stage of crystallization (less than 30 min), the two samples have similar crystallization rates. In the late stage of crystallization (more than 30 min), the rolled samples show a faster crystallization rate. To a certain extent, this shows that the crystallization activation energy calculated by the JMA formula and the crystallization start temperature Tx and the peak temperature Tp can not fully reflect the thermal stability of the amorphous alloy. In addition, the weakening of the interconnections between atoms in the shear band and the strengthening of short-range order reduce the thermal stability of the rolled samples and the crystallization process becomes faster.