Microstructure and Microhardness of Tempered Ni-Al Alloyed Layer

Yue Yang and Hua Wu College of Materials Science and Engineering,Changchun University of Technology,Changchun,130012,China

摘 要：A Nd:YAG pulsed laser was used to alloy the Ni-P electroless deposited coating with aluminum substrate under the condition of scanning speed of 3.0 mm/s and power density of 5.36×10 9 W/m 2.Subsequently,the samples were heat treated at 300,400 and 500 C for 2.5 h,respectively.The phase composition and microstructure of the tempered layers treated at different temperature were identified by X-ray diffraction（XRD）,scanning electron microscopy（SEM） and transmission electron microscopy（TEM）.The results showed that the phase constituents of the alloyed zones were intermetallic compounds of NiAl,Al 3 Ni,Ni 3 P and AlNi 3.As a result,the microhardness of the alloyed layer after heat treatment was improved obviously compared to untreated samples,and the layer obtained at temperature 400 C reached HV 0.1 430.

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