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| Dynamic recrystallization kinetics model and deformation behavior in Ni-15%Pt alloy target under 135° clock rolling |
| XU Xin1,2, XU Rui1,2,*, FENG Guofang3, LI Wei1,2,4, SHEN Bangpo1,2,4, MA Shengcan1,2,4 |
1. Jiangxi Provincial Key Laboratory of Magnetic Metallic Materials and Devices/Ganzhou Key Laboratory for Rare Earth Magnetic Functional Materials and Physics, College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou 341000, China;
2. National Rare Earth Functional Material Innovation Center/Guorui Scientific Innovation Rare Earth Functional Materials Co., Ltd, Ganzhou 341000, China;
3. Technolopy Analysis and Testing Center, Jiangxi University of Science and Technology,Ganzhou 341000, China;
4. School of Materials Science and Engineering, Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou 341000, China |
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Abstract Based on the work hardening rate-stress (θ-σ) curves, the critical strain model and kinetics model for dynamic recrystallization were established for Ni-15%Pt (mass fraction) alloy target. Three rolling processes were designed, such as clock 135° synchronous rolling, clock 135° asynchronous rolling, and clock 135° snake rolling. Combined with DEFORM-3D numerical simulations, a comparative study was conducted on the metal flow velocity, equivalent strain distribution, and rolling force of the rolled pieces under synchronous and asynchronous rolling processes. The evolution of the equivalent strain at the core of the rolled pieces under the three processes was analyzed, and the damage values under clock 135° snake rolling with different offset distances were compared. The results indicate that clock 135° asynchronous rolling induces a deeper deformation layer and higher metal flow velocity and equivalent strain compared to synchronous rolling. Moreover, the maximum rolling force during asynchronous rolling is reduced by up to 22.21%, as part of the energy is utilized to generate cross shear stress, thereby reducing the risk of defect formation. Under clock 135° snake rolling, a minimum damage value of 0.97 is achieved at an offset distance of 8 mm, which effectively corrects the plate warping induced by asynchronous rolling. This study provides important guidance for the parameter setting of hot rolling processes for metal and alloy targets.
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Received: 09 September 2025
Published: 10 March 2026
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2026, Vol. 31 
