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本文研究了不同条件下形成的非易态Fe_(78)B_(13)Si_9合金在长轴和短轴方向上的热膨胀。结果表明,在所有条件下均存在热膨胀的各向异性。热膨胀系数随着冷却速度的增加而增加,但其各向异性减小;随着熔体喷铸温度的提高两者均减小。在热循环的作用下,短轴方向的热膨胀系数及其各向异性均减小;而在长轴方向的热膨胀系数却增大。我们认为热膨胀各向异性来源于原子交互作用力的方向性、原子振动频率和短程有序结构或缺陷的方向性。
In this paper, the thermal expansion of the non-viable Fe 78 B 13 Si 9 alloy formed under different conditions in the long axis and the short axis are studied. The results show that there is anisotropy of thermal expansion under all conditions. The coefficient of thermal expansion increases with increasing cooling rate, but its anisotropy decreases; both decrease as the melt-casting temperature increases. Under thermal cycling, the coefficients of thermal expansion and their anisotropy in the direction of the minor axis decrease, while the coefficients of thermal expansion in the direction of the major axis increase. We think the anisotropy of thermal expansion comes from the directionality of the atomic interaction force, the atomic vibration frequency and the directivity of the short-range ordered structure or defect.