ISSN   1004-0595

CN  62-1095/O4

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李继文, 王爱琴, 谢敬佩, 王文焱, 李洛利, 魏世忠. 快速凝固过共晶铝硅合金的微观组织特征及耐磨性研究[J]. 摩擦学学报, 2010, 30(2): 111-117.
引用本文: 李继文, 王爱琴, 谢敬佩, 王文焱, 李洛利, 魏世忠. 快速凝固过共晶铝硅合金的微观组织特征及耐磨性研究[J]. 摩擦学学报, 2010, 30(2): 111-117.
LI Ji-wen, Wang Ai-qin, XIE Jing-pei, WANG Wen-yan, LI Luo-li, WEI Shi-zhong. Microstructure and Wear Resistance of Rapidly Solidified Hypereutectic Al-Si Alloys[J]. TRIBOLOGY, 2010, 30(2): 111-117.
Citation: LI Ji-wen, Wang Ai-qin, XIE Jing-pei, WANG Wen-yan, LI Luo-li, WEI Shi-zhong. Microstructure and Wear Resistance of Rapidly Solidified Hypereutectic Al-Si Alloys[J]. TRIBOLOGY, 2010, 30(2): 111-117.

快速凝固过共晶铝硅合金的微观组织特征及耐磨性研究

Microstructure and Wear Resistance of Rapidly Solidified Hypereutectic Al-Si Alloys

  • 摘要: 利用单辊旋淬快速凝固法制备Al-21Si和Al-30Si过共晶铝硅合金,采用扫描电镜、透射电镜及XRD技术对所制备合金的组织形貌和相结构进行表征。结果表明:快速凝固合金形成微纳米晶组织,晶粒明显细化。Al-21Si过共晶合金凝固组织由羽毛针状(α-Al+β-Si) 共晶体和雪花状α-Al相组成;快速凝固有效抑制初生硅相的形核与生长,α-Al相领先共晶形核生长,形成微纳米级亚共晶组织。Al-30Si高硅过共晶合金初生硅相细小钝化,初晶Si相显微结构为孪晶形貌,呈典型的过共晶组织特征。快速凝固显著提高合金显微度及其耐磨性,快速凝固Al-21Si合金的耐磨性是传统铸造合金的5倍。

     

    Abstract: Rapidly solidified hypereutectic Al-21Si and Al-30Si alloys were prepared by a single roller melt-spinning technique. The microstructure and phases of the alloys were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). Fine grains with a micro-nano composite microstructure were obtained by rapid solidification. The microstructures of the Al-21Si alloys were characterized by primary micro-nanostructured α-Al phase and feather-needle-like α-Al+β-Si eutectic. The nucleation and growth of primary silicon were effectively inhibited. α-Al phase had a higher priority to nuclate and grow than eutectic α+Si phase. The hypereutectic Al-21Si alloy showed the hypoeutectic microstructure. The primary Si phases in Al-30Si alloy were fine twins. And this microstructures were a typical hypereutectic microstructure. Microhardness and wear resistance (i.e. 5 times as high as that of traditional casting alloys) of alloys were greatly improved by rapidly solidification.

     

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