日本金属学会誌

J. Japan Inst. Metals, Vol. 63, No. 12 (1999),
pp. 1567-1575

Influences of Distribution of Fiber Strength and Residual Stresses on TensileStrength of SiC Fiber-reinforced TiAl Matrix Composites

Shojiro Ochiai1, Takayuki Fujita1, Mototsugu Tanaka1,Masaki Hojo1, Ryohei Tanaka2, Ko Miyamura2,
Hirotoshi Nakayama3, Masaaki Yamamoto2 and Masakuni Fujikura3

1Mesoscopic Materials Research Center, Graduate School of Engineering, Kyoto University, Kyoto 606-8501
2Japan Ultra-high Temperature Materials Research Institute, Yamaguchi Institute, Ube 755-0001

3Japan Ultra-high Temperature Materials Research Institute, Gifu Institute, Tajimi 507-0801

Abstract:

Tensile behavior of SiC/TiAl composite was investigated. Main results are:
(1) The interface of the composite was weak. The fracture of the composite was accompanied by the fracture of matrix, fracture and pull-out of fibers, and interfacial debonding along the whole length between grips.

(2) Under the condition that strength of individual fiber is determined by the largest defect, the extreme value distribution function was applied for description of the distribution of the size of the maximum defect of fibers, and the strength of the composite at room temperature based on the fiber bundle strength was calculated. The experimentally measured strength could be accounted for by this calcuation.

(3) From the results of a Monte Carlo simulation, it was suggested that the improvement of frature strain of the matrix and minimization of the residual stresses are needed to achieve high strength.


(Received July 26, 1999; In Final Form September 30, 1999)

Keywords:

silicon carbide fiber-reinforced titanium aluminide, tensile strength, damage, interfacial debonding, matrix cracking, pull-out, distribution of fiber strength, residual stress


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