Thermal stability of dimension in fiber reinforced aluminum alloy.
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概要
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Alumina short fiber reinforced aluminum alloy (FRM) is expected to have the potential to provide high strength and great durability as the automotive engine components. However, the dimensional changes of FRM under cyclic heating condition is not so well established that it is important to study the thermal stability of dimension in FRM in advance in designing the automotive engine components. In this study, thermal stability of dimension in FRM on heating and cooling has been examined with the following experimental results. (1) On rapid cooling its dimension along the fiber orientation decreased compared with the initial dimension. (2) The decrease in dimension is enhanced when the matrix contains the alloying elements or the cooling rate is high. (3) At elevated temperatures, its dimension increased gradually. (4) In-situ observation with the Ultra High Voltage Electron Microscope shows that the dislocation tangles in the matrix are released on heating, and that new dislocation tangles are formed on cooling. It is concluded that the thermal stability of dimension in FRM depends on the stress due to the mismatch of thermal expansion coefficient between fiber and matrix, and on the amount of stress relaxation induced by slip deformation in the matrix on cooling.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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