Ti/Al HIP焼結体の組織と性質に及ぼすミリング条件の影響

概要

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Ti and Al powder mixtures with nine compositions(Ti-10at.%Al-90at.%Al) were milled with milling balls of various sizes(2.0-19.1mm) by a vibratory ball mill and were sintered by HIP (Hot Isostatic Pressing). The microstructure and material properties of the sintered compacts were investigated by optical microscopy, SEM. TEM, X-ray diffraction, microhardness measurement, electrical resistivity mesaurement and modified small punch(MSP) test. It was found that the microstructure and the material properties of the sintered compacts were strongly dependent on the milling ball size, milling time and the starting powder composition. A nearly single phase intermetallic compound with more refined structure and higher MSP energy and strength was formed on longer milling time. The sintered compact with the starting composition of Ti-50at.%Al showed the highest MSP strength and energy, which can be related to the well refined microstructure with ultrafine dispersoids of Ti.Al in TiAl matrix.
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