AA6082板材剪切变形过程中金属间断裂的显微组织阶段

IF 2.1 Q2 ENGINEERING, MULTIDISCIPLINARY

Cogent Engineering Pub Date : 2023-09-30 DOI:10.1080/23311916.2023.2262820

Vijayalaxmi Sonkamble, K. Narasimhan, Asim Tewari

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引用次数: 0

摘要

为了解AA6082(T6)板材的断裂机理，研究了剪切带的渐进变形过程。合金的断裂特征可由金属间颗粒决定。该合金的损伤演化过程定量表征为应变函数。较大的、细长的、取向良好的颗粒首先断裂(具有初始变形)，随着逐渐变形(落料)，较小的、圆形的颗粒开始断裂。这些破碎的颗粒成为裂纹核，使基体开裂和凝聚。在初始变形阶段，颗粒碎裂发生，但没有明显的孔洞生长。然而，在随后的变形阶段，破碎过程随着先前破碎颗粒的多次破碎和再破裂而增强。更大的颗粒在更低的应变下随孔洞生长而形成孔洞。裂纹在剪切带中开始，最好是从冲头侧开始(冲头侧比模具侧更锋利)，并且发现裂纹几乎平行于加载轴。

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Microstructural stages of intermetallic fracture during sheared deformation of AA6082 sheet

The progressive deformations of a shear band formation were studied to understand the fracture mechanism of AA6082(T6) sheets. The fracture characteristics of the alloys can be dictated by the intermetallic particles. Damage evolution of the alloy is quantitatively characterized as a function of strain. Larger, elongated, and favorably oriented particles fracture first (with initial deformation), and with progressive deformation (blanking), smaller and rounded particles start breaking. These broken particles become a crack nucleus for matrix cracking and coalescences. In the initial deformation stages, fragmentation of particles takes place without significant void growth. However, with subsequent deformation stages, the fragmentation process has been enhanced with multi-fragmentation and re-fracturing of previously broken particles. Larger particles nucleate voids at much lower strains with void growth. Crack has initiated in the shear band, preferably from the punch side (the punch side is sharper than the die side), and cracks are found almost parallel to the loading axis.

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来源期刊

Cogent Engineering ENGINEERING, MULTIDISCIPLINARY-

CiteScore

4.00

自引率

5.30%

发文量

213

审稿时长

13 weeks

期刊介绍： One of the largest, multidisciplinary open access engineering journals of peer-reviewed research, Cogent Engineering, part of the Taylor & Francis Group, covers all areas of engineering and technology, from chemical engineering to computer science, and mechanical to materials engineering. Cogent Engineering encourages interdisciplinary research and also accepts negative results, software article, replication studies and reviews.