کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1582192 | 1514870 | 2008 | 9 صفحه PDF | دانلود رایگان |
Fiber push-out tests were performed on continuous Al2O3 fiber-reinforced NiAl-composites with and without hBN-interlayer at room temperature (RT) and elevated temperature (900 °C). The average interfacial shear stress was 248 ± 42 MPa and 72 ± 28 MPa for NiAl/Al2O3 and NiAl/BN/Al2O3 composites at room temperature, respectively. At 900 °C, the push-out tests were aborted for NiAl/Al2O3 composites because of fiber fracture and cracking owing to mechanical twinning on rhombohedral {1 0 1¯ 2} planes in single crystalline Al2O3 fibers, whereas the average interfacial shear stress was 13 ± 7 MPa for NiAl/BN/Al2O3 composites. The debonding position along the interface as well as the initiation of debonding on the top surface of NiAl/Al2O3 and NiAl/BN/Al2O3 composites were determined and discussed. Frictional coefficients of 0.29 and 0.11 for fiber sliding after interface debonding were obtained for NiAl/Al2O3 and NiAl/BN/Al2O3 composites at room temperature, respectively.
Journal: Materials Science and Engineering: A - Volume 488, Issues 1–2, 15 August 2008, Pages 372–380