Enhancement on mechanical properties of CoCrNi medium entropy alloy via cold spray additive manufacturing associated with sintering

Zhang，Yongyun1,2; Qin，Bailiang1; Chan，Kang Cheung1; Lupoi，Rocco2; Yin，Shuo2; Xie，Yingchun3; Ye，Shulong4; Yu，Peng5; Ke，Haibo6; Wang，Weihua6,7

2023-05-26

10.1016/j.jmapro.2023.03.017

Journal of Manufacturing Processes   Impact Factor & Quartile

1526-6125

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.

CoCrNi medium entropy alloy Cold spraying additive manufacturing Microstructures evolution Properties improvement Sintering strategies

English

Others

National Natural Science Foundation of China[52104362];

2-s2.0-85151522612

Scopus

1.State Key Laboratory of Ultra-precision Machining Technology,Department of Industrial and Systems Engineering,The Hong Kong Polytechnic University,Hong Kong
2.Trinity College Dublin,The University of Dublin,Department of Mechanical and Manufacturing Engineering,Dublin 2,Parsons Building,Ireland
3.National Engineering Laboratory for Modern Materials Surface Engineering Technology,The Key Lab of Guangdong for Modern Surface Engineering Technology,Guangdong Institute of New Materials,Guangzhou,510651,China
4.Faculty of Materials Science,Shenzhen MSU-BIT University,Shenzhen,518172,China
5.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
6.Songshan Lake Materials Laboratory,Dongguan,523808,China
7.Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China

Zhang，Yongyun,Qin，Bailiang,Chan，Kang Cheung,et al. Enhancement on mechanical properties of CoCrNi medium entropy alloy via cold spray additive manufacturing associated with sintering[J]. Journal of Manufacturing Processes,2023,94:413-423.

Zhang，Yongyun.,Qin，Bailiang.,Chan，Kang Cheung.,Lupoi，Rocco.,Yin，Shuo.,...&Wang，Weihua.(2023).Enhancement on mechanical properties of CoCrNi medium entropy alloy via cold spray additive manufacturing associated with sintering.Journal of Manufacturing Processes,94,413-423.

Zhang，Yongyun,et al."Enhancement on mechanical properties of CoCrNi medium entropy alloy via cold spray additive manufacturing associated with sintering".Journal of Manufacturing Processes 94(2023):413-423.