Abstract

The present study aims to propose a new and non-complex sintering method in powder metallurgy in order to manufacture a light material with high mechanical properties. The proposed new sintering method is based on the principle that compaction is applied to a heated sample following classical sintering method. In this way, microstructure and mechanical properties of new samples manufactured using the proposed post sintering compaction method were compared with the samples manufactured using classical sintering method. In this context, in order to find the most optimal Al–Zn alloy ratio, different weight percentages of Zn (5–15–25–35–45%) were added to Al. When the manufactured alloys with classical sintering and post sintering compaction methods were compared, the most optimal alloy ratio was observed to be 15% Zn (Al–15Zn) manufactured using post sintering compaction method. In the next step, the matrix alloy with the most optimal ratio was reinforced with B₄C in different weight percentages (1–2–3%) to manufacture Al matrix composites using post sintering compaction method. The microstructure analysis of the manufactured samples demonstrated that reinforcement particles were generally located at the grain boundaries and these particles caused the presence of porosities around them. In addition, mechanical test results indicated that increasing reinforcement ratio affected mechanical properties negatively. It can be thus concluded that a composite material with 1% B₄C reinforcement ratio was superior to matrix alloy (Al–15Zn) in terms of microstructure, density, absorbed energy, hardness and compressive strength, and thus it is a critical reinforcement ratio in improving material properties.

中文翻译：

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采用新型烧结方法制备的 B4C 增强 Al-Zn 合金基复合材料的显微组织和力学性能分析

摘要

本研究旨在提出一种新的、非复杂的粉末冶金烧结方法，以制造具有高机械性能的轻质材料。所提出的新烧结方法是基于按照经典烧结方法将压实应用于加热样品的原理。通过这种方式，使用所提出的烧结后压制方法制造的新样品的微观结构和机械性能与使用经典烧结方法制造的样品进行了比较。在这种情况下，为了找到最佳的 Al-Zn 合金比例，在 Al 中添加了不同重量百分比的 Zn（5-15-25-35-45%）。当比较采用经典烧结和烧结后压制方法制造的合金时，观察到最佳合金比例是使用后烧结压实方法制造的 15% Zn (Al-15Zn)。在下一步中，具有最佳比例的基体合金用B增强₄ C 以不同的重量百分比 (1-2-3%) 使用烧结后压实方法制造铝基复合材料。制造样品的微观结构分析表明，增强颗粒通常位于晶界处，这些颗粒导致它们周围存在孔隙。此外，力学测试结果表明，增加配筋率对力学性能有负面影响。由此可以得出结论，1% B ₄ C 增强比的复合材料在组织、密度、吸收能、硬度和抗压强度方面均优于基体合金（Al-15Zn），因此它是临界增强比在改善材料性能方面。