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Friction Stir Welding of Bulk Metallic Glass - Vitreloy 106A

出版	South Dakota School of Mines and Technology, Rapid City, 2006
URL	http://books.google.com.hk/books?id=90yRNwAACAAJ&hl=&source=gbs_api

註釋The objective of the work was to determine if the metallic glass, Vitreloy 106A, could be friction stir processed and retain it amorphous nature in the welded region and, if so, to establish the processing window. In this investigation a sample of Vitreloy 106A provided by Dr. Katharine M. Flores, Assistant Professor, Dept. of Material Science and Engineering, Ohio State University. Small (3x3 in.) room-temperature and preheated material was friction stir processed with selected processing parameters ranging from 300 to 800 RPM and travel speeds of 0.5 to 2 in./min. using polycrystalline cubic boron nitride and W-Re pin tools. The preheated weld was quenched with liquid nitrogen. X-ray diffraction and differential scanning calorimeter methods were used to determine that the extent of devitrification decreased with increased average specific heat input, pseudo heat index I (PRM/IPM * plunge) and pseudo heat index II (PRM/IMP * forge force). Friction stir plunges did not cause devtrification. Linear welds ranged from 38 to 79 percent devitrified. Better plastization was observed for the preheated weld, which was approximately 50 percent devitrified. Improved results are thought possible with larger samples.