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Phase Separation Process at Early Aging Stage of Ni42CrTiAl

材料热处理学报 2004年第5期25卷 191-194页

作者： weiying-hui houli-feng jiaoshao-yang hulan-qing xubing-she TaiyuanUniversityofTechnology TaiyuanChina

Phase separation process of Ni42CrTiAl alloy aged at various temperatures was studied by means of transmission electron microscope and X-ray diffraction. It was concluded that the temperature of spinodal decomposition is 500 °C. And the solid solution break into the lean and the rich areas, moreover the rich solute areas would have ordering arrangement to form ordering phase.

关键词：旋节线分析有序化相位变换 Ni42CrTiAl合金

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Investigation on Interface Structure and Wear-resistant Properties of HVOF Sprayed Carbides Coating onto Copper Substrate

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材料热处理学报 2004年第05B期25卷 942-947页

作者： houli-feng ZHANGHeng-jin weiying-hui YANKai hulan-qing xubing-she DepartmentofMaterialsScience TaiyuanUniversityofTechnologyTaiyuanChina qingdaoYanChongshengthermalLab QingdaoChina

In this paper, we deposited carbides on copper substrate by High velocity oxy-fuel (HVOF) spraying. The structure of the coating and microstructure of the substrate-coating interface have been investigated by means of scanning electron microscope (SEM) and transmission electron microscopy (TEM). We observed the worn surface of the coating and investigated the wear mechanism. The results show that the microstructure of the interface between HVOF sprayed coating and substrate which consists of the amorphous layers, nanocrystalls in the coating and dislocation cells in copper substrate, etc. is complex. The amorphous layers are formed from heated adhesion after rapidly cooling, while the nanocrystalls come from the fragmentation of half-molten carbides. At the same time we found that the wear-resistant properties of the WC-Co coating is better than that of Cr3C2-NiCr coating at room temperature. The early wear-resistance of the HVOF sprayed coating is poor because of the roughness of its surface or bad bond of hard composite particles. The high velocity of molten droplets is propitious to fill up the interspaces between carbides, so as to make the coating more compact and reduce its porosities, thus the wear-resistance of carbides coatings is improved.

关键词： HVOF 碳化物涂层抗磨损性铜底层

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