Effect of heat treatment on ordering and functional properties of the Fe–19Ga alloy
Effect of heat treatment on ordering and functional properties of the Fe–19Ga alloy
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DOI：
10.1016/j.jallcom.2014.08.231
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发表时间：
2015-01
影响因子：
6.2
通讯作者：
A. Emdadi;J. Cifre;O. Y. Dementeva;I. Golovin
中科院分区：
文献类型：
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作者：
A. Emdadi;J. Cifre;O. Y. Dementeva;I. Golovin
本文重点研究了冷却速率对多晶Fe - 19at的微观结构、功能性能、磁致伸缩性能和内摩擦性能的影响。% Ga样品。在900和1000℃退火40分钟后，样品被水淬（wq）或炉冷（fc）。高分辨x射线衍射（XRD）结果表明，当样品在900℃（fc900℃）冷却时，在2θ= 81°附近有峰肩，这是由于d03有序析出相的形成。在900°C （wq900°C）和1000°C （wq1000°C）水淬的样品中只记录到具有A2结构的固溶相。900℃试样（wqann）淬火后的水在350℃下退火2 h，由于d03相的出现，也导致在2θ= 81°附近形成一个肩形。磁力显微镜（MFM）研究了wq900°C样品的磁畴结构，发现wq900°C样品的磁畴结构为规则排列的条形结构，而fq900°C样品和wqann样品的磁畴结构均为不规则的迷宫状结构。样品的磁致伸缩是作为外加磁场的函数来测量的。结果发现，wq1000°c样品对外加磁场的磁致伸缩最大，而fc900°c样品对外加磁场的磁致伸缩最小；因此，wq样品的阻尼能力也是最高的。对wq、fc和退火样品进行了振幅、频率和温度相关的内摩擦试验。在A2→d03相变的基础上，分析了非弹性效应的热历史依赖性。讨论了观测到的非弹性效应的物理机制。膨胀法和量热法的研究结果与200-300℃淬火样品中A2 （bcc）→D03（bcc基）有序现象一致。
Special attention in this work is paid to the study of the influence of cooling rates on microstructure and functional properties, magnetostrictive behavior and internal friction of polycrystalline Fe – 19 at.% Ga samples. After annealing at 900 and 1000 °C for 40 min, samples were water quenched (wq) or furnace cooled (fc). High resolution X-ray diffraction (XRD) exhibits the peak shoulder around 2θ= 81° for the sample furnace-cooled from 900 °C (fc900°C), which is ascribed to the formation of D03ordered precipitates. Only a solid solution phase with an A2 structure is recorded in the samples water-quenched from 900 °C (wq900°C) and 1000 °C (wq1000°C). Annealing during 2 h at 350 °C of the water quenched from 900 °C specimen (wqann) also leads to the formation of a shoulder around 2θ= 81° due to the appearance of the D03phase. Magnetic domain structure studied by magnetic force microscopy (MFM) reveals that thewq900°Csample exhibits a regularly aligned stripe domain structure, while irregular maze-like domain structure is observed in both thefc900°C, andwqannsamples. Magnetostriction of the samples is measured as a function of an externally applied magnetic field. It was found that thewq1000°Csample comprises the highest magnetostriction, while thefc900°Candwqannsamples have the lowest magnetostriction against the applied magnetic field; consequently, the damping capacity inwqsamples is also the highest. Amplitude-, frequency- and temperature dependent internal friction tests ofwq,fc, andannealedsamples were carried out. Thermal history dependence of anelastic effects is analyzed on the basis of the A2 → D03transformation. Physical mechanisms for observed anelastic effects are discussed. Dilatometry and calorimetry studies are in agreement with the A2 (bcc) → D03(bcc-based) ordering phenomenon at 200–300 °C in as quenched samples.