金属基複合材料SiC_<CVD>/Ti-15-3の450℃でのクリープ : クリープ破断の原因の検討

概要

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Creep tests of a continuous fiber-reinforced metal matrix composite, SiC_<CVD>/Ti-15-3, were performed in the stress range of 800 to 1200 MPa at 450℃. The fibers were oriented at 0℃ to the specimen axis, and the volume fraction of fibers was 35%. We measured strain and acoustic emission in the creep tests, together with observation of damage of fibers after the tests, and found the following. When stress is high, creep rupture occurs largely due to stress relaxation in the matrix in spite of the noncreeping property of fibers. Under such intermediate stress as 1000 MPa, which is lower than the creep strength based on the stress relaxation in matrix, creep rupture does take place owing to the degradation of fibers besides the stress relaxation in matrix. Under such low stress as 800 MPa, on the other hand, creep rupture hardly occurs, because the stress relaxation in matrix does not induce sufficient increase of fiber stress, and because evolution of internal damage is not significant.
社団法人日本機械学会の論文
1994-03-25