| Summary: | 碩士 === 國立成功大學 === 材料科學及工程學系碩博士班 === 98 === Recently, the golf heads design focuses on magnifying their size in order to increase the sweet spot area. By this, it is easier for the golfer driving the ball farther and straighter. Less weight, low density, high strength, and high elasticity are the important conditions for golf head materials. Most titanium alloys possess the same strength as common grades of stainless steel, but are 40% less dense (the weight per volume area).
First, the effects on the castability of Ti-Al-Mo alloy of the bismuth(Bi) addition are examined. After getting the conclusion that the addition of bismuth reduce the castability of Ti-Al-Mo alloy, the mechanical properties of Ti-alloy X and Ti-alloy Y alloys fabricated by investment-casting and hot rolling were investigated individually, and the thicknesses of αcase of Ti-alloy which is produced as casting are examined as well.
Compare with commercial alloy Ti-6Al-4V, experimental esults of mechanical properties indicate that Ti-alloy X possesses equivalent yielding strength and higher ultimate tensile strength and ductility; Ti-alloy Y possesses the best tensile strength, but the lowest ductility.
Passing through investment-casting, Ti-alloy Y possesses heavierαcase; passing through hot rolling, the thicknesses of αcase have no difference between Ti-alloy X and Ti-alloy Y .
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