Abstract
A deeper understanding of the mechanical behavior of ultra-fine (UF) and nanocrystalline (NC) grained metals is necessary with the growing interest in using UF and NC grained metals for structural applications. The cyclic deformation response and behavior of UF and NC grained metals is one aspect that has been gaining momentum as a major research topic for the past ten years. Severe Plastic Deformation (SPD) materials are often in the spotlight for cyclic deformation studies as they are usually in the form of bulk work pieces and have UF and NC grains. Some well known techniques in the category of SPD processing are High Pressure Torsion (HPT), Equal Channel Angular Pressing (ECAP), and Accumulative Roll-Bonding (ARB). In this report, the literature on the cyclic deformation response and behavior of SPDed metals will be reviewed. The cyclic response of such materials is found to range from cyclic hardening to cyclic softening depending on various factors. Specifically, for SPDed UF grained metals, their behavior has often been associated with the observation of grain coarsening during cycling. Consequently, the many factors that affect the cyclic deformation response of SPDed metals can be summarized into three major aspects: (1) the microstructure stability; (2) the limitation of the cyclic lifespan; and lastly (3) the imposed plastic strain amplitude.
Highlights
The small size grains in the ultra-fine (UF) and nanocrystalline (NC) grained metals and alloys provide a significant increase in mechanical strength compared to its conventional grain sized counterparts
The small grain sizes in such materials lead to the deviation of its mechanical behavior from that described by conventional dislocation theories [1,2,3,4,5]
The aim of this paper is to review the trends of the cyclic deformation behavior of Severe Plastic Deformation (SPD) metals reported in literature and the factors that influence such cyclic deformation behavior
Summary
The small size grains in the ultra-fine (UF) and nanocrystalline (NC) grained metals and alloys provide a significant increase in mechanical strength compared to its conventional grain sized counterparts. The small grain sizes in such materials lead to the deviation of its mechanical behavior from that described by conventional dislocation theories [1,2,3,4,5]. Another emerging technique that is gathering interest is Accumulative Roll-Bonding (ARB), first reported in [8,9] These techniques are known to be capable of producing products with dimensions large enough for standardized specimen designs, making them popular for mechanical behavior studies. Other SPD techniques include High Pressure Torsion (HPT) [10], Multi-Directional Forging (MDF) [11], Cyclic Extrusion and Compression (CEC) [12], and so on. The aim of this paper is to review the trends of the cyclic deformation behavior of SPD metals reported in literature and the factors that influence such cyclic deformation behavior
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