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化学学报
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化学学报 ›› 2002, Vol. 60 ›› Issue (7): 1215-1219. 上一篇    下一篇

研究论文

Al-TM合金熔体的中程有序结构及其演化规律

边秀房;王伟民;潘学民;秦绪波   

  1. 山东大学,济南(250061)
  • 发布日期:2002-07-15

Evolution of Medium Range Order Structure in Al-TM Alloy Metls

Bian Xiufang;Wang Weimin;Pan Xuemin;Qin Xubo   

  1. The Key Laboratory of Liquid Structure and Heredity of Materials of State Education, Ministry, Shandong University,Jinan(250061)
  • Published:2002-07-15

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被引次数

21 | 3

用高温溶体X射线衍射仪对Al-TM（TM = Fe, Ni）合金的熔体结构进行了实验 研究。在Al-1.0at%Fe（原子百分比）合金的结构因子曲线S（Q）上，温度为670 ℃时，存在预峰，即中程有序结构，当温度过热到1400 ℃时，预峰消失。Al- 20at%Ni合金熔体温度在≤1300 ℃范围内，存在预峰；温度高于1400 ℃时，预峰 逐渐消失。这些实验结果表明，Al-Ni, Al-Fe合金熔体中除存在短程有序结构外， 还存在中程有序结构。这种中程有序结构的存在与消失与温度有关。在相似的条件 下，Al-Si合金中没有发现中程有序结构。本文对中程有序结构的演化机理也作了 探讨。

关键词: 熔体, 铝合金, 硅合金, 镍合金, X射线衍射分析

Liquid structure of Al-TM (TM = Fe, Ni) alloys was studied by high temperature X-ray diffractometer. In the structure factor S (Q) of Al- 1.0 at% Fe ally, it is found that there exists a small prepeak at 670 ℃ , implying the medium range order (MRO) structure; the prepeak disappears when the temperature is up to 1400 ℃. For Al-20at% Ni alloy, the prepeak exists in S(Q) when the temperature is lower than 1300 ℃, and it is weakened drastically when the temperature surpasses 1300 ℃. In the same experiment conditions, there is no such prepeak, namely MRO structure in S(Q) of pure Al and Al-12.5at% Si alloy. These results show that there exists not only the short range order (SRO) structure but also MRO structure in the Al-TM melts, and the MRO is correspondent with the tendency of formation of chemical compounds.

Key words: FUSE ELEMENTS, ALUMINIUM ALLOYS, SILICON ALLOYS, NICKEL ALLOYS, XRD

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