RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      선택해제

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • SCISCIESCOPUS

        Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion

        Heczel, Anita,Kawasaki, Megumi,,,r, Já,nos L.,Jang, Jae-il,Langdon, Terence G.,Gubicza, Jenő Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.711 No.-

        <P><B>Abstract</B></P> <P>An equiatomic CoCrFeMnNi High-Entropy Alloy (HEA) produced by arc melting was processed by High-Pressure Torsion (HPT). The evolution of the microstructure during HPT was investigated after ¼, ½, 1 and 2 turns using electron backscatter diffraction and transmission electron microscopy. The spatial distribution of constituents was studied by energy-dispersive X-ray spectroscopy. The dislocation density and the twin-fault probability in the HPT-processed samples were determined by X-ray line profiles analysis. It was found that the grain size was gradually refined from ∼60 μm to ∼30 nm while the dislocation density and the twin-fault probability increased to very high values of about 194 × 10<SUP>14</SUP> m<SUP>−2</SUP> and 2.7%, respectively, at the periphery of the disk processed for 2 turns. The hardness evolution was measured as a function of the distance from the center of the HPT-processed disks. After 2 turns of HPT, the microhardness increased from ∼1440 MPa to ∼5380 MPa at the disk periphery where the highest straining is achieved. The yield strength was estimated as one-third of the hardness and correlated to the microstructure.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The microstructure and the hardness in HPT processed CoCrFeMnNi HEA were studied. </LI> <LI> The dislocation density increased up to 194 × 10<SUP>14</SUP> m<SUP>−2</SUP> after 2 turns of HPT. </LI> <LI> The grain size decreased to 27 nm at the periphery of the disk processed by 2 turns. </LI> <LI> After 2 turns the twin fault probability increased to 2.7% at the disk periphery. </LI> <LI> The hardness increased from 1440 MPa to 5380 MPa due to 2 turns of HPT. </LI> </UL> </P>

      연관 검색어 추천

      이 검색어로 많이 본 자료

      활용도 높은 자료

      해외이동버튼