Dynamic temperature resistometry analysis of rapidly quenched Fe86B14 alloy and its correlated study by Mössbauer spectroscopy and scanning electron microscopy
Dynamic temperature resistometry analysis of rapidly quenched Fe86B14 alloy and its correlated study by Mössbauer spectroscopy and scanning electron microscopy
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DOI：
10.1016/0921-5093(94)90230-5
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发表时间：
1994-05
期刊：
影响因子：
6.4
通讯作者：
A. Ashfaq;A. Shamim;S. Siddiqi;M. Arshed
中科院分区：
文献类型：
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作者：
A. Ashfaq;A. Shamim;S. Siddiqi;M. Arshed
采用动态温度电阻测量法研究了在氦气气氛中以恒定升温速率（17、40、80 K h-1）从室温到900 K的单辊熔体快淬法制备的非晶态Fe 86 B 14合金的稳定性和晶化行为。晶化温度随升温速率的增大先升高后降低。在正向和反向方向记录的数据，表明在非晶区的不同行为。穆斯堡尔谱被用来研究在结晶度-温度（RT）曲线中所涉及的各个步骤和在样品上形成的相应相，所述样品在被展示出经受相同的热处理之后被空气淬火。在最后的温度下，原样样品显示出一定百分比的γ-Fe相;然而，其值随着结晶的进行而增加。非晶基体形成的第一个产物相为α-Fe，随后同时形成亚稳相Fe 3B和Fe 2B，导致电阻率迅速下降。Fe 3B在较高温度下断裂成α-Fe和Fe 2B，这也通过RT曲线中的陡峭和突然下降来突出。这些最终相的百分比几乎保持恒定，直到最终温度，这与RT曲线的线性上升一致。扫描电子显微镜分析揭示了在加热时破碎成碎片的原样样品中的无定形区域中存在圆形和带状区域。
Dynamic temperature resistometry has been used in order to characterize the stability and crystallization behaviour of amorphous Fe86B14alloy prepared by the single-roll melt spinning technique in a helium atmosphere at constant heating rates (17, 40, 80 K h−1) from room temperature to 900 K. The crystallization temperature first increases and then decreases with the increase in heating rate. The data were recorded in forward and reverse directions, indicating different behaviour in the amorphous region. Mössbauer spectroscopy was used to study various steps involved in the resistivity-temperature (RT) curve and corresponding phases formed on samples air quenched after being exhibited subjected to the same heat treatments. The as-received sample exhibited some percentage of γ-Fe phase up to the last temperature; however, its value increases as crystallization proceeds. The first product phase formed from the amorphous matrix was observed to be α-Fe, followed simultaneously by metastable Fe3B and Fe2B, resulting in a rapid decrease in resistivity. Fe3B breaks into α-Fe and Fe2B at higher temperatures, which is also highlighted by a steep and sudden fall in the RT curve. The percentages of these final phases almost remain constant up to the final temperature which is in agreement with the linear rise of the RT curve. Scanning electron microscopy analysis revealed the presence of round and ribbon-shaped zones in amorphous areas in the as-received sample which break up into pieces on heating.