Effect of fiber coating on the mechanical behavior of SiC fiber-reinforced titanium aluminide composites

1993 ◽  
Vol 8 (4) ◽  
pp. 905-916 ◽  
Author(s):  
S.M. Jeng ◽  
J-M. Yang ◽  
J.A. Graves
Keyword(s):  
Mechanical Behavior ◽  
Titanium Aluminide ◽  
Effective Diffusion ◽  
Fiber Surface ◽  
Model Material ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Fiber Coating ◽  
Sic Fiber

The effects of fiber surface coatings on the mechanical behavior and damage mechanisms of SCS-6 fiber-reinforced titanium aluminide matrix composites have been studied. Two different coating layers are used as model material: a brittle TiB2 and a ductile Ag/Ta duplex layer. The role of the coating layer on the interfacial reaction, interfacial properties, and mechanical behavior of the composites was characterized. Results indicate that both TiB2 and Ag/Ta are effective diffusion barriers in preventing fiber/matrix interfacial reactions during composite consolidation. However, the deformation mechanisms and crack propagation characteristics in these two coated composites are quite different. The criteria for selecting an improved interlayer to tailor a strong and tough fiber-reinforced titanium aluminide matrix composite are also discussed.

Effect of fiber coating on creep behavior of SiC fiber-reinforced titanium aluminide matrix composites

1994 ◽  
Vol 9 (1) ◽  
pp. 198-206 ◽  
Author(s):  
Hsing-Pang Chiu ◽  
J-M. Yang ◽  
J.A. Graves
Keyword(s):  
Creep Behavior ◽  
Matrix Cracking ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Transverse Loading ◽  
Damage Mechanisms ◽  
Fiber Coating ◽  
Duplex Coating ◽  
Sic Fiber ◽  
Stress Levels

The effect of fiber coating on the creep behavior and damage mechanisms of unnotched SCS-6 fiber-reinforced Ti3Al matrix composites under longitudinal and transverse loading was investigated at 700 °C. Stresses ranging from 700 to 900 MPa and 200 to 400 MPa were used for longitudinal and transverse loading, respectively. An Ag/Ta duplex layer was coated onto the SCS-6 fiber prior to consolidation via physical vapor deposition. The microstructure of the crept composites was examined to determine the creep deformation mechanisms. The creep cracking behavior of the notched composites was also studied at initial stress intensity factors, Ki, ranging from 15 to 20 MPa-m1/2. Microstructural observation revealed that multiple fiber fracture (at low to medium stress levels), microcracking along the reaction zone/matrix interface (at medium stress levels), and matrix cracking extending from the broken fiber ends (at high stress levels) were the major damage mechanisms during quasi-steady state creep under longitudinal loading. The results show that the Ag/Ta duplex coating significantly improved the creep resistance and flexural strength of the composite under transverse loading. The Ag/Ta duplex coating was also shown to significantly prolong the creep rupture life of SiC fiber-reinforced Ti3Al composites.

scholarly journals The Role of Fiber Coating on SiC Fiber-Reinforced Alumina Composite

1992 ◽  
Vol 100 (1160) ◽  
pp. 499-503 ◽  
Author(s):  
J. X. LI ◽  
Yohtaro MATSUO ◽  
Shiushichi KIMURA
Keyword(s):  
Fiber Reinforced ◽  
Fiber Coating ◽  
Sic Fiber ◽  
Alumina Composite

Effect of C/SiC interphase on interfacial and mechanical properties of SiC fiber reinforced mullite matrix composites

2021 ◽  
Vol 98 (2) ◽  
pp. 335-341
Author(s):  
Guihang Deng ◽  
Xun Sun ◽  
Zhenghao Tian ◽  
Ru Jiang ◽  
Haitao Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Sic Fiber

Mechanical Behavior of SiC Fiber Reinforced Al Matrix Composites: A Study Based on Finite Element Method

2011 ◽  
Vol 239-242 ◽  
pp. 2785-2789
Author(s):  
Chao Sun ◽  
Min Song ◽  
Ru Juan Shen ◽  
Yong Du
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aspect Ratio ◽  
Plastic Region ◽  
Matrix Composites ◽  
Fiber Reinforced ◽  
Sic Fiber ◽  
Al Matrix Composites ◽  
Al Matrix ◽  
Element Method

The effects of SiC fiber shape, aspect ratio and loading direction on the deformation behavior of SiC fiber reinforced Al matrix composites were studied by finite element method using axisymmetric unit cell model. The results showed that the addition of reinforcements will cause constraint on the plastic flow of ductile matrix, and thus result in no-uniform stress distribution. The reinforcement shape has a pronounced effect on the overall plastic deformation of the metal matrix composites. The loading condition will cause different failure mechanisms of composites. Under tensile loading, the stress-bearing ability in the plastic region is increased with the fiber aspect ratio due to the increase in the interface between the reinforcement and matrix and the decrease in the inter-particle space.

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