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Fabrication of phosphor bronze/Al two-phase material by recycling phosphor bronze chips using hot extrusion process and investigation of their microstructural and mechanical properties
International Journal of Minerals, Metallurgy and Materials ( IF 4.8 ) Pub Date : 2020-06-10 , DOI: 10.1007/s12613-020-1980-9
Majid Hosseini , Mohammad Hossein Paydar

Despite the existence of conventional methods for recycling chips, solid-state techniques have become popular, whereby waste metals are directly recycled into consolidated products with the desired shapes and designs. We investigated the feasibility of recycling phosphor bronze chips through a hot extrusion process using aluminum powder as a metal binder for the fabrication of a metal-fiber-reinforced aluminum matrix composite. To do so, mixtures containing 20vol%–50vol% of chips were prepared, cold-compacted, and extruded. The quality of the consolidated samples was evaluated by determining the density of the fabricated composites and studying their microstructures. In addition, we performed tensile and hardness tests to evaluate the mechanical properties of the fabricated composites. We also analyzed the fracture surfaces of the samples to study the fracture mechanism as a function of the volume fraction of phosphor bronze chips in the fabricated composite. The results indicated that the most effective consolidation occurred in the sample containing 20vol% of chips extruded at 465°C in which the chips serve as ideal fibers for improving the mechanical properties, especially the ultimate tensile strength, in comparison with those of Al matrixes that contain no chips but are produced under the same conditions.



中文翻译:

通过热挤压工艺回收磷青铜芯片制备磷青铜/ Al两相材料及其微观组织和力学性能

尽管存在用于回收芯片的常规方法,但是固态技术已变得流行,由此将废金属直接回收成具有所需形状和设计的固结产品。我们研究了通过热挤压工艺回收磷青铜芯片的可行性,该工艺使用铝粉作为金属粘结剂制造金属纤维增强的铝基复合材料。为此,准备了含有20%(体积)至50%(体积)碎屑的混合物,冷压并挤出。通过确定制造的复合材料的密度并研究其微观结构来评估固结样品的质量。此外,我们进行了拉伸和硬度测试,以评估制成的复合材料的机械性能。我们还分析了样品的断裂表面,以研究断裂机理与所制造复合材料中磷青铜芯片体积分数的关系。结果表明,最有效的固结发生在含有20vol%碎屑的样品中,该碎屑在465°C下挤出,与Al基基体相比,碎屑是改善机械性能(尤其是极限拉伸强度)的理想纤维。不含切屑,但在相同条件下生产。

更新日期:2020-06-10
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