논문 국내 국제전문학술지(SCI급) Tensile Properties and Serrated Flow Behavior of As-Cast CoCrFeMnNi High-Entropy Alloy at Room and Elevated Temperatures
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2019-03
- 저자명 김정한,Young Sang Na
- 학술지명 METALS AND MATERIALS INTERNATIONAL
- 발행처명 KOREAN INST METALS MATERIALS
- 발행국가 국내
- 논문언어 외국어
- 전체저자수 2
홈페이지논문 초록 (Abstract)
The tensile properties and serrated flow behavior of as-cast CoCrFeMnNi high-entropy alloy were examined over a wide range of temperatures. Tensile elongations were higher at 22 degrees C than at high temperatures above 700 degrees C. With the increase in the temperature from 500 to 700 degrees C, distinct serration flows occurred and evolved in the sequence of type A, type B, and type C serrations. Anisotropy in the tensile properties and serrated flow was identified. The average stress drop amplitude in the serrated flow was generally higher when tensile loading was applied perpendicular to the columnar grain growth direction. Moreover, 700 degrees C, the strain increment required for subsequent stress drops was significantly lower when tensile loading was applied perpendicular to the columnar grain growth direction. The start and finish temperatures of serration flow were slightly higher in as-cast HEA by 100-200 degrees C compared to those in wrought HEA.