Enhancement of strength-ductility synergy of in situ synthesized graphene/Ni composite via Mo microalloying

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2024-11-05 DOI:10.1016/j.msea.2024.147496

Ying Liu , Sen Zhang , Yupeng Yao , Leilei Fan , Jian Wang , Yanxia Wu , Lin Jing , Peide Han , Caili Zhang

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Abstract

The ideal mechanical performances of in-situ synthesized graphene/Ni composite have not been obtained due to the weak interfacial bonding. To realize the high strengthening efficiency of graphene, this paper proposed a Mo microalloying strategy. The influences of Mo concentration on the microstructures, interfacial bonding characteristics, and quasi-static tensile behavior of the composite were investigated. The results showed an appropriate Mo concentration (0.2 wt%) not only enabled a strong interfacial bonding but also reduced the stacking fault energy of the Ni matrix, generating the twinning and further altering the strength and plasticity. The yield and tensile strength of the composite were increased by 215.3 % and 20.3 %, respectively, but no significant reduction in plasticity was observed. The strengthening of the composite was ascribed to the effective load transfer, twinning, and dislocation strengthening, whereas the critical role of large-area graphene nanosheets and deformation twinning in suppressing the crack propagation ensured a high toughness.

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通过钼微合金化提高原位合成石墨烯/镍复合材料的强度-电导率协同效应

由于界面结合力较弱，原位合成的石墨烯/镍复合材料尚未获得理想的力学性能。为了实现石墨烯的高强化效率，本文提出了一种 Mo 微合金化策略。研究了 Mo 浓度对复合材料微观结构、界面结合特性和准静态拉伸行为的影响。结果表明，适当的钼浓度（0.2 wt%）不仅能使界面结合牢固，还能降低镍基体的堆积断层能，产生孪晶，进一步改变强度和塑性。复合材料的屈服强度和拉伸强度分别提高了 215.3% 和 20.3%，但塑性没有明显降低。复合材料的强化归因于有效的载荷传递、孪晶和位错强化，而大面积石墨烯纳米片和变形孪晶在抑制裂纹扩展方面的关键作用则确保了高韧性。

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.