Microstructure and Mechanical Properties of Al-Cu-Mn Alloy Mechanically Alloyed with 5 wt% Zr After Multi-Directional Forging

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-09-09 DOI:10.1007/s12540-024-01800-y

A. S. Prosviryakov, A. I. Bazlov, M. S. Kishchik, A. V. Mikhaylovskaya

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Abstract

Zr-containing aluminum-based alloys and especially Al-Zr composites have high thermal resistance due to the formation of Al₃Zr dispersoids from supersaturated aluminum solid solution. The use of mechanical alloying can significantly increase the solubility of zirconium and improve the strength properties at elevated temperatures. The aim of the present work is to investigate the effect of multi-directional forging (MDF) on the microstructure and properties of Al-Cu-Mn alloy mechanically alloyed with 5 wt%Zr. Mechanical alloying was carried out by ball milling for 20 h at 300 rpm. The temperature of hot pressing and subsequent MDF operation was 400 °C. SEM, XRD and TEM were used to study the microstructure. In this work, it was shown that MDF leads to the formation of a poreless structure compared to hot pressing due to strain accumulation during hot deformation, as well as grain growth and microhardness reduction. At the same time, the highest compressive yield strength at 350 °C of 132 MPa was achieved after forging. The obtained material consisted of nanocrystalline aluminum matrix and secondary precipitates of Al₃Zr with cubic (L1₂) and tetragonal (D0₂₃) lattices as well as Al₂₀Cu₂Mn₃ phase.

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多向锻造后机械合金化了 5 wt% Zr 的 Al-Cu-Mn 合金的显微组织和力学性能

含锆铝基合金，尤其是铝锆复合材料具有很高的耐热性，这是因为过饱和铝固溶体形成了 Al3Zr 分散体。使用机械合金可以显著提高锆的溶解度，改善高温下的强度性能。本研究旨在探讨多向锻造（MDF）对含 5 wt%Zr 的铝铜锰合金微观结构和性能的影响。机械合金化是通过球磨进行的，球磨时间为 20 小时，转速为 300 转/分。热压和随后的中密度纤维板操作温度为 400 ℃。使用 SEM、XRD 和 TEM 研究了微观结构。研究结果表明，与热压相比，中密度纤维板在热变形过程中由于应变积累以及晶粒长大和显微硬度降低而导致无孔结构的形成。同时，锻造后在 350 °C 时达到了 132 兆帕的最高压缩屈服强度。所获得的材料由纳米晶铝基体、具有立方（L12）和四方（D023）晶格的 Al3Zr 二次析出物以及 Al20Cu2Mn3 相组成。

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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.