TY - JOUR
T1 - Faceted Kurdjumov-Sachs interface-induced slip continuity in the eutectic high-entropy alloy, AlCoCrFeNi2.1
AU - Xiong, Ting
AU - Yang, Wenfan
AU - Zheng, Shijian
AU - Liu, Zhaorui
AU - Lu, Yiping
AU - Zhang, Ruifeng
AU - Zhou, Yangtao
AU - Shao, Xiaohong
AU - Zhang, Bo
AU - Wang, Jun
AU - Yin, Fuxing
AU - Liaw, Peter K.
AU - Ma, Xiuliang
N1 - Publisher Copyright:
© 2020
PY - 2021/2/28
Y1 - 2021/2/28
N2 - Recently, the eutectic high-entropy alloy (EHEA), AlCoCrFeNi2.1, can reach a good balance of strength and ductility. The dual-phase alloy exhibits a eutectic lamellar microstructure with large numbers of interfaces. However, the role of the interfaces in plastic deformation have not been revealed deeply. In the present work, the orientation relationship (OR) of the interfaces has been clarified as the Kurdjumov-Sachs (KS) interfaces presenting 111B2||110FCC and 110B2||111FCC independent of their morphologies. There exist three kinds of interfaces in the EHEA, namely, (321)B2||(112)FCC, (011¯)B2||(332¯)FCC, and (231¯)B2||(552)FCC. The dominating (321)B2||(112)FCC interface and the secondary (011¯)B2||(332¯)FCC interface are both non-slip planes and atomistic-scale faceted, facilitating the nucleation and slip transmission of the dislocations. The formation mechanism of the preferred interfaces is revealed using the atomistic geometrical analysis according to the criteria of the low interfacial energy based on the coincidence-site lattice (CSL) theory. In particular, the ductility of the dual-phase alloy originates from the KS interface-induced slip continuity across interfaces, which provides a high slip-transfer geometric factor. Moreover, the strengthening effect can be attributed to the interface resistance for the dislocation transmission due to the mismatches of the moduli and lattice parameters at the interfaces.
AB - Recently, the eutectic high-entropy alloy (EHEA), AlCoCrFeNi2.1, can reach a good balance of strength and ductility. The dual-phase alloy exhibits a eutectic lamellar microstructure with large numbers of interfaces. However, the role of the interfaces in plastic deformation have not been revealed deeply. In the present work, the orientation relationship (OR) of the interfaces has been clarified as the Kurdjumov-Sachs (KS) interfaces presenting 111B2||110FCC and 110B2||111FCC independent of their morphologies. There exist three kinds of interfaces in the EHEA, namely, (321)B2||(112)FCC, (011¯)B2||(332¯)FCC, and (231¯)B2||(552)FCC. The dominating (321)B2||(112)FCC interface and the secondary (011¯)B2||(332¯)FCC interface are both non-slip planes and atomistic-scale faceted, facilitating the nucleation and slip transmission of the dislocations. The formation mechanism of the preferred interfaces is revealed using the atomistic geometrical analysis according to the criteria of the low interfacial energy based on the coincidence-site lattice (CSL) theory. In particular, the ductility of the dual-phase alloy originates from the KS interface-induced slip continuity across interfaces, which provides a high slip-transfer geometric factor. Moreover, the strengthening effect can be attributed to the interface resistance for the dislocation transmission due to the mismatches of the moduli and lattice parameters at the interfaces.
KW - AlCoCrFeNi
KW - Dislocation
KW - High-entropy alloy
KW - Interface
KW - Kurdjumov-Sachs (KS)
UR - http://www.scopus.com/inward/record.url?scp=85092441885&partnerID=8YFLogxK
U2 - 10.1016/j.jmst.2020.04.073
DO - 10.1016/j.jmst.2020.04.073
M3 - 文章
AN - SCOPUS:85092441885
SN - 1005-0302
VL - 65
SP - 216
EP - 227
JO - Journal of Materials Science and Technology
JF - Journal of Materials Science and Technology
ER -