Conjoint influence of equal channel angular pressing and annealing on microstructure and mechanical properties of aluminum alloy 7075 Gemeinsamer Einfluss des Gleichkanal-Winkelpressens und des Glühens auf das Gefüge und die mechanischen Eigenschaften der Aluminiumlegierung EN AW-AlZn5,5MgCu

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materialwissenschaft und Werkstofftechnik Pub Date : 2024-08-28 DOI:10.1002/mawe.202300379

V. Pouyafar, F. Malihi, R. Meshkabadi

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Abstract

The effect of equal channel angular pressing combined with inter-pass and post-process annealing on the microstructure and mechanical properties of the Al-7075 alloy has been studied. The samples underwent successful equal channel angular pressing for three passes using the B_c route. The most significant changes in mechanical properties were observed after the first pass. Despite an 88 % reduction in grain size, the hardness of the alloy increased by 45 % and the fracture toughness decreased by 75 %. Post-process annealing was found to be an effective method for enhancing the alloy‘s toughness. Annealing the one-pass sample at 310 °C resulted in a 33 % increase in fracture toughness; from 15.8 J to 21.02 J. Inter-pass annealing had a lesser impact on improving fracture toughness compared to post-process annealing. It can be concluded that a balanced combination of strength and toughness can be achieved by utilizing a combination of equal channel angular pressing and inter-pass or post-process annealing. Examination of the fracture surfaces of the samples revealed intragranular fractures, with the annealed samples exhibiting higher energy absorption during impact and better toughness compared to the non-annealed sample.

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等沟道角冲压和退火对 7075 铝合金微观结构和机械性能的联合影响等沟道角冲压和退火对 EN AW-AlZn5,5MgCu 铝合金微观结构和机械性能的联合影响

研究了等沟道角向压制结合工序间退火和工序后退火对 Al-7075 合金微观结构和机械性能的影响。样品采用 Bc 路线成功地进行了三次等沟角压制。机械性能的最明显变化出现在第一道工序之后。尽管晶粒尺寸减少了 88%，但合金的硬度增加了 45%，断裂韧性降低了 75%。研究发现，后处理退火是提高合金韧性的有效方法。单程样品在 310 °C 退火后，断裂韧性提高了 33%，从 15.8 J 提高到 21.02 J。与工序后退火相比，工序间退火对提高断裂韧性的影响较小。由此可以得出结论，通过结合使用等通道角压制和层间退火或后处理退火，可以实现强度和韧性的平衡。对样品断裂表面的检查显示，退火样品与未退火样品相比，在冲击过程中具有更高的能量吸收能力和更好的韧性。

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来源期刊

Materialwissenschaft und Werkstofftechnik 工程技术-材料科学：综合

CiteScore

2.10

自引率

9.10%

发文量

154

审稿时长

4-8 weeks

期刊介绍： Materialwissenschaft und Werkstofftechnik provides fundamental and practical information for those concerned with materials development, manufacture, and testing. Both technical and economic aspects are taken into consideration in order to facilitate choice of the material that best suits the purpose at hand. Review articles summarize new developments and offer fresh insight into the various aspects of the discipline. Recent results regarding material selection, use and testing are described in original articles, which also deal with failure treatment and investigation. Abstracts of new publications from other journals as well as lectures presented at meetings and reports about forthcoming events round off the journal.