Abstract
During plastic deformation, the change of structural states is known to be complicated and indeterminate, even in single crystals. This contributes to some enduring problems like the prediction of deformed texture and the commercial applications of such material. In this work, plane strain compression (PSC) tests were designed and implemented on single crystal pure aluminum to reveal the deformation mechanism. PSC tests were performed at different strain rates under strain control in either one-directional or two-directional compression. The deformed microstructures were analyzed according to the flow curve and the electron back-scattered diffraction (EBSD) mappings. The effects of grain orientation, strain rate, and strain path on the deformation and mechanical response were analyzed. Experimental results revealed that the degree of lattice rotation of one-dimensional compression mildly dependents on cube orientation, but it is profoundly sensitive to the strain rate. For two-dimensional compression, the softening behavior is found to be more pronounced in the case that provides greater dislocations gliding freeness in the first loading. Results presented in this work give new insights into aluminum deformation, which provides theoretical support for forming and manufacturing of aluminum.
Highlights
The mechanical behavior of aluminum is of significant technological interest since aluminum is incredibly popular in engineering structures and components for its lightweight and superior corrosion resistance [1]
A long-term goal in this research direction would be the understanding of the microstructure and texture of face-centered cubic (FCC) metal after deformation and to develop models for predicting the strain hardening of such material
This work orientates itself to study the deformed microstructure of single crystal with three characteristic factors: the grain orientation, the strain rate, and the strain path changes (SPCs)
Summary
The mechanical behavior of aluminum is of significant technological interest since aluminum is incredibly popular in engineering structures and components for its lightweight and superior corrosion resistance [1]. A long-term goal in this research direction would be the understanding of the microstructure and texture of face-centered cubic (FCC) metal after deformation and to develop models for predicting the strain hardening of such material. Non-monotonic deformations usually occur in the metal forming process [16,17,18,19], such as multistep cross rolling [16], equal channel angular pressing [19] and reverse shearing [17,18], and have major implications in the mechanical behavior of the materials [20,21,22,23]. Different strain hardening and deformation mechanisms of the metals associate with three variables in the process (the grain orientation, the strain rate, and the SPCs) are demonstrated in flow curves. The coordinate system used in describing the sample geometry follows terminology for rolled
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