발간논문

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Vol.23, No.4, 393 ~ 406, 1985
Title
Deformation Behaviors of Unidirectionally Solidified Al - Fe - Ni Alloy at Elevated Temperature
이순우Soon Woo Lee, 우기도Kee Do Woo, 조현기Hyun Kee Cho
Abstract
The investigation has been carried out for the clarifing of the microstructure variation, stress-strain behavior, high temperature stability and fracture behavior at elevated temperature in unidirectionally solidified Al-FeNiAl_9 eutectic composite alloy by means of detailed measurements of stress-strain and scanning electron micrography. The thermal stability under unloded state of FeNiAl_9 eutectic phase at elevated temperature is more prominent than that of FeAl₃eutectic phase. The fracture strain decrease with increasing the solidification rate and the maximum fracture stress increase with increasing the strain rate at elevated temperature. The fracture mode in deforming at elevated temperature is divided into two types, one is the brittle fracture mode which occured in the region of low temperature-high strain rate, and the other is the ductile fracture mode which occured in the region of high temperature-low strain rate. The brittle fracture is occured by the growth of microcracks originated on fiber defects. And the ductile fracture is occured by the formation of shearing deformation band produced by structural release in matrix-fiber interface.
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