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Product Code: PIC2008_P204

Nonequilibrium Synthesis of Ni-Al-Si Alloys by Laser Processing
Authors:
Yufeng Zheng, Lanzhou University of Technology; Lanzhou Peoples Republic of China
Yaoning Sun, Lanzhou University of Technology; Lanzhou Peoples Republic of China
Ding Fan, Lanzhou University of Technology; Lanzhou Peoples Republic of China
Min Zheng, Lanzhou University of Technology; Lanzhou Peoples Republic of China
Jianbin Zhang, Lanzhou University of Technology; Lanzhou Peoples Republic of China
Presented at PICALO 2008

In the present work, three kinds of powder blend with nominal compositions of Ni75Al25 (at.%), Ni75Al15Si10 (at.%) and Ni75Al5Si20 (at.%) have been successfully fabricated by a continuous wave 10kW carbon dioxide laser under optimum processing conditions. X-ray diffraction (XRD) results showed that the phases of all the specimens mainly consist of Ni-Al type intermetallic compounds. The microstructures of three alloys were characterized using scanning electron microscopy (SEM) and electron-probe microanalysis (EPMA). The microhardnesses were measured on a HX-1000TM type microhardness tester. The maximum of the microhardness is up to 740Hv with the composition of Ni75Al15Si10.

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