Atmospheric-controlled induction-heating fine particle peening (AIH-FPP) treatment was performed for titanium alloy to fabricate Ti-Al intermetallic compounds through the transfer and diffusion of shot particle element. High-speed steel particles and aluminum particles were mechanically milled, and high-speed steel particles coated with thin aluminum layers were created. The created particles were used as shot particles for AIH-FPP treatment. Al transferred layers were created on the surface of titanium alloy by AIH-FPP treatment. Heating to a high temperature after peening created Ti-Al intermetallic compounds with high hardness because the Al transferred to the treated surface during peening was diffused into the titanium alloy.
This study was performed to find a method to reduce the consumption of expensive diamond abrasive grains in polishing glass substrates, and to mix low-hardness abrasives with diamond abrasives to reduce costs and achieve early improvement of surface roughness. The effects of the size of the GC abrasives (approximately 127 μm, 75 μm, and 13 μm), abrasive concentration, and types of abrasives (WA and B4C) were clarified for low-hardness abrasives. The abrasive grains were fluorescently stained with rhodamine B to determine their behavior on the polished surface in-situ. The results indicated improved surface roughness by using two types of mixed abrasive grains. In addition, the large-grain GC abrasives moved or were shown to be trapped in the gaps of the fibers of the natural silk polishing pad used for polishing. On the other hand, diamond grains with an average grain size of 1.0 μm moved between the natural silk polishing pad and the glass substrate regardless of the fiber orientation.