论文部分内容阅读
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.
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. Substituted, 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 temperatures 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.