TY - JOUR
T1 - Enhancement on mechanical properties of CoCrNi medium entropy alloy via cold spray additive manufacturing associated with sintering
AU - Zhang, Yongyun
AU - Qin, Bailiang
AU - Chan, Kang Cheung
AU - Lupoi, Rocco
AU - Yin, Shuo
AU - Xie, Yingchun
AU - Ye, Shulong
AU - Yu, Peng
AU - Ke, Haibo
AU - Wang, Weihua
N1 - Funding Information:
The work described in this paper was mainly supported by the funding support to the State Key Laboratories in Hong Kong from the Innovation and Technology Commission (ITC) of the Government of the Hong Kong Special Administrative Region (HKSAR), China. The authors would also like to express their sincere thanks to the financial support from the Research Office (Project code: BBXD and BBX2) of The Hong Kong Polytechnic University , the National Natural Science Foundation of China (Grant No. 52104362 ), the Shenzhen Science and Technology Innovation Committee (Grant No. KQJSCX20180322152424539 ), the Research Fund of the State Key Laboratory of Solidification Processing (Grant No. SKLSP202011 ), the International Cooperation Project of Guangdong Province (Grant No. 2021A0505030052 ) and the Guangdong Major Project of Basic and Applied Basic Research, China (Grant No. 2019B030302010 ).
Publisher Copyright:
© 2023 The Society of Manufacturing Engineers
PY - 2023/5/26
Y1 - 2023/5/26
N2 - Equimolar CoCrNi medium entropy alloy (MEA) has a broad potential for industrial applications due to its excellent strength-ductility synergy. In this study, the emerging solid-state cold spray additive manufacturing (CSAM) approach was applied to fabricate bulk CoCrNi MEA deposits for the first time. However, due to its nature, CSAM normally results in limited metallurgical bonding and weak interfacial bonding between deformed particles, particularly for high-strength alloys such as the CoCrNi MEA used in this work. Therefore, a post-sintering treatment with temperatures ranging from 1200 °C to 1350 °C was applied after CSAM to improve the interparticle bonding and strengthen the as-fabricated MEA deposits. During the sintering process, recovery, recrystallization, sintering necks and grain migration for polycrystalline growth were observed at different stages. The sintering treatment significantly enhanced the tensile strength and ductility of the as-fabricated sample from ∼240 MPa and ∼2 % to ∼660 MPa and 43 %. This study validates the potential of the united CSAM-sintering strategy in additive manufacturing of CoCrNi MEA.
AB - Equimolar CoCrNi medium entropy alloy (MEA) has a broad potential for industrial applications due to its excellent strength-ductility synergy. In this study, the emerging solid-state cold spray additive manufacturing (CSAM) approach was applied to fabricate bulk CoCrNi MEA deposits for the first time. However, due to its nature, CSAM normally results in limited metallurgical bonding and weak interfacial bonding between deformed particles, particularly for high-strength alloys such as the CoCrNi MEA used in this work. Therefore, a post-sintering treatment with temperatures ranging from 1200 °C to 1350 °C was applied after CSAM to improve the interparticle bonding and strengthen the as-fabricated MEA deposits. During the sintering process, recovery, recrystallization, sintering necks and grain migration for polycrystalline growth were observed at different stages. The sintering treatment significantly enhanced the tensile strength and ductility of the as-fabricated sample from ∼240 MPa and ∼2 % to ∼660 MPa and 43 %. This study validates the potential of the united CSAM-sintering strategy in additive manufacturing of CoCrNi MEA.
KW - CoCrNi medium entropy alloy
KW - Cold spraying additive manufacturing
KW - Microstructures evolution
KW - Properties improvement
KW - Sintering strategies
UR - https://www.scopus.com/pages/publications/85151522612
U2 - 10.1016/j.jmapro.2023.03.017
DO - 10.1016/j.jmapro.2023.03.017
M3 - Journal article
AN - SCOPUS:85151522612
SN - 1526-6125
VL - 94
SP - 413
EP - 423
JO - Journal of Manufacturing Processes
JF - Journal of Manufacturing Processes
ER -