首页|Significant annealing-induced hardening effect in nanolaminated-nanotwinned(CrCoNi)97.4Al0.8Ti1.8 medium-entropy alloy by severe cold rolling

Significant annealing-induced hardening effect in nanolaminated-nanotwinned(CrCoNi)97.4Al0.8Ti1.8 medium-entropy alloy by severe cold rolling

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Due to the easy coarsening caused by poor thermal stability,the verified annealing-induced hardening in nanograined metals can only maintain at a relatively low-temperature range.In this study,a nanolam-inated(CrCoNi)97.4Al0.8Ti18 medium-entropy alloy with an average lamellae thickness of～20 nm em-bedded by thinner nanotwins was fabricated by severe cold rolling to achieve superior thermal stability.Compared with the conventional nanotwinned CrCoNi with nanotwins inside ultra-fined grains,the hier-archical nanolaminated-nanotwinned(CrCoNi)97.4Al0.8Ti18 exhibits a significant annealing-induced hard-ening effect,i.e.,hardness increasing from～250 HV in the original specimen to～500 HV in the cold-rolled status and finally～630 HV after annealing at 600 ℃ for 1 h.Detailed microstructure charac-terizations reveal that the reduced dislocation density and formation of L12 ordered domain are mainly responsible for such hardening effect,which is facilitated by the effectively suppressed coarsening with annealing temperature,i.e.,slow detwinning process and well-retained low-angle nanolamellar structure.The coarsening mechanisms from the cold-rolled nanolamellae to the fully recrystallized micro-equiaxed structures under the annealing temperatures ranging from 400 to 800 ℃ were also elucidated by atomic observations.

Annealing-induced hardeningThermal stabilityNanolaminated-nanotwinned structureCrCoNiDetwinningGrain boundary migration

Shuqing Yuan、Hui Fu、Lei Qian、Chi Fai Cheung、Xu-Sheng Yang

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State Key Laboratory of Ultra-precision Machining Technology,Department of Industrial and Systems Engineering,The Hong Kong Polytechnic University,Hung Hom,Kowloon,Hong Kong,China

Hong Kong Polytechnic University Shenzhen Research Institute,Shenzhen 518060,China

国家自然科学基金Guangdong Basic and Applied Basic Research FoundationPolyU FundState Key Laboratories in Hong Kong from the Innovation and Technology Commission of the Government of the HKASR,ChinaResearch Committee of PolyUResearch Committee of PolyU

519711872022A1515011322G-YBZ3RK2JRK2U

2024

10.1016/j.jmst.2023.06.016

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.170(3)
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