X線回折法によるアルミナ繊維強化Al-5%Cu合金の熱応力測定

概要

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The stress generated as a result of the difference in coefficient of thermal expantion between matrix and fiber was measured during the heating and cooling processes of a γ-alumina fiber-reinforced Al-5%Cu alloy. In order to understand the thermally induced residual stress better, an automated device was used by which in-situ X-ray diffraction measurements at elevated temperatures could be performed. The composite with 50 vol% of 17 μm diam. Fibers was fabricated by a squeeze casting method, and was given an aging heat teatment which consisted of heating the composite to 800K for 4 hr, water quenching and reheating to 463K for 6 hr. At room temperature (RT) the matrix of the water quenched composite showed a tensile thermal residual stress of 80 MPa. In-situ measuremnets on the composite heated up to 463K showed a constant matrix compressive stress of -50 MPa during the whole aging period of 6 hr. In the subsequent thermal cycling process of the aged composite, the matrix stress changed elastically between -50 MPa at 463K and 100 MPa at RT. On heating back to RT after cooling the composite to RT from 463K and then to liquid nitrogen temperature, a reduction of the residual stress was observed. On further heating of the composite from RT, plastic deformation of the matrix was observed.
社団法人日本材料学会の論文
1993-06-15