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金敎漢 영남이공대학 1983 論文集 Vol.12 No.-
The effects of annealing and subzero treatment on thermal dilation of the Al-Al_3Ni eutectic composite were studied in relation to the residual stress and matrix yielding. For the composite annealed at 500℃ for 1hr, the heating curve forms a hysteresis loop with cooling curve on the test up to 300℃, and a small region of inflection is observed on each curve. By the subzero treatment at-196℃ for 10min, the inflection temperature on heating is lowered, but on cooling, it remains unchanged and no hysteresis loop is formed. In the temperature range which reaches the inflection region on heating and cooling tests, the fiber and the matrix undergo elastic deformation. The matrix begins to yield at the inflection on the heating curve of the subzeroed composite, the inflection region is observed near room temperature corresponds to the matrix yielding. The Al_3Ni fibers in the cycled material developed surface serrations which increased with maximum cycling temperature and number of cycles. The formation of these serrations is attributed to the increasing solubility of the Al_3Ni fibers in the matrix with temperature.