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首页> 外文期刊>Materials Science and Engineering >Effect of layer architecture on the mechanical behavior of accumulative roll bonded interstitial free steel/aluminum composites
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Effect of layer architecture on the mechanical behavior of accumulative roll bonded interstitial free steel/aluminum composites

机译：层架构对累积辊粘合间隙自由钢/铝复合材料力学行为的影响

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摘要

Multi-layered interstitial free (IF) steel/aluminum (Al) composites were fabricated by the accumulative roll bonding (ARB) method. Two types of IF steel/A16061 dissimilar layered metal composites (LMC) with varied stacking of aluminum layers were processed to examine the effect of the layer architecture. Microhardness and uniaxial tensile experiments were applied to analyze the surface and bulk monotonic mechanical properties. Besides, the cyclic mechanical response of the processed materials was investigated via high cycle fatigue (HCF) tests with positive mean stress. Microstructure and mechanical characteristics of composites with various layer architectures were analyzed up to five ARB passes. It is revealed that the monotonic and cyclic performances of all LMCs are significantly enhanced as compared to the base alloy with an aluminum layered structure. Moreover, composites with aluminum as the outer layer exhibited the highest fatigue life, due to crack branching at the interface region during propagation from the softer to the harder layer. Fracture morphology analysis of composites demonstrated that in addition to the significant impact of surface cracks on the outer layers, propagation of cracks initiating from the interface layers led to failure under cyclic loading.
机译：通过累积辊粘合（ARB）方法制造多层间隙自由（IF）钢/铝（Al）复合材料。加工两种类型的钢/ A16061不同的分层金属复合材料（LMC），具有变化的铝层的堆叠，以检查层架构的效果。施用显微硬度和单轴拉伸实验以分析表面和散装单调机械性能。此外，通过高循环疲劳（HCF）试验来研究加工材料的环状机械响应，具有正平均应力。分析了各种层架构复合材料的微观结构和机械特性，最多可达五个ARB通过。据透露，与具有铝层状结构的基础合金相比，所有LMC的单调和环状性能明显增强。另外，由于在从更柔软的层到更难的层的界面区域的裂缝分支，具有铝的复合材料表现出最高的疲劳寿命。复合材料的断裂形态分析证明，除了表面裂缝对外层的显着影响之外，裂缝从界面层发起的传播导致了循环载荷下的故障。

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