A Study on the Microstructural Evolution, Interfacial Diffusion and Mechanical Properties of Ultra-thin Stainless Steel–Copper Composites Fabricated by Roll Bonding

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-05-04 DOI:10.1007/s12540-024-01682-0

Yanyang Qi, Xiaoguang Ma, Linan Ma, Cunlong Zhou, Zhengyi Jiang, Jingwei Zhao

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Abstract

Systematic study on the microstructural evolution, interfacial diffusion and mechanical properties of ultra-thin stainless steel–copper composites (50 µm) after annealing treatment was conducted in the present study. The results show that the as-received specimen exhibits low elongation (0.031) as well as high strength (891.346 MPa) by work hardening, thus requires heat treatment to improve the plasticity. With the increase of annealing temperature from 700 to 1000 °C, the dislocation/grain boundary strengthening is weakened while the surface grains which exhibit fewer constraints is increasing, resulting in lower strength. Moreover, a uniform and refined microstructure with high recrystallization rate is formed inside stainless steel and copper matrixes for the specimens annealed at 900 °C, thereby improving the plasticity of ultra-thin stainless steel–copper composites. Additionally, an obvious strain gradient exists at the interface of ultra-thin stainless steel–copper composites, and the interdiffusion process between stainless steel and copper matrixes is primarily governed by the diffusion of Cu atoms. The influence of diffusion layer thickness on the strength of ultra-thin stainless steel–copper composites is negligible. Overall, an optimal annealing temperature of 900 °C is obtained with the improved plasticity of ultra-thin stainless steel–copper composites.

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轧制粘接法制造的超薄不锈钢-铜复合材料的微观结构演变、界面扩散和力学性能研究

本研究对超薄不锈钢-铜复合材料（50 微米）退火处理后的微观结构演变、界面扩散和力学性能进行了系统研究。结果表明，加工硬化后的试样具有较低的伸长率（0.031）和较高的强度（891.346 兆帕），因此需要通过热处理来改善塑性。随着退火温度从 700 ℃ 升至 1000 ℃，位错/晶界的强化作用减弱，而表面晶粒的约束减少，导致强度降低。此外，在 900 ℃ 退火的试样中，不锈钢和铜基体内部形成了具有高再结晶率的均匀而精细的微观结构，从而改善了超薄不锈钢-铜复合材料的塑性。此外，超薄不锈钢-铜复合材料的界面存在明显的应变梯度，不锈钢和铜基体之间的相互扩散过程主要受铜原子扩散的影响。扩散层厚度对超薄不锈钢-铜复合材料强度的影响可以忽略不计。总体而言，900 °C的最佳退火温度可改善超薄不锈钢-铜复合材料的塑性。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.