Experimental and Modelling Study of Ultra-Fine Grained ZK60 Magnesium Alloy with Simultaneously Improved Strength and Ductility Processed by Parallel Tubular Channel Angular Pressing

Mechanical properties modeling of severely plastically deformed biodegradable ZK60 magnesium alloy for bone implants

“…The details of the fabrication and characterization of the UFG ZK60 Mg are described elsewhere (Mesbah et al, 2019). In brief, a particular die with a φi channel as well as Ψ1 = 150° and Ψ2 = 0° curvature angles were made-up from hot-worked tool steel H13 hardened to 55 HRC, followed by the PTCAP using an INSTRON press machine.…”

“…It should be mentioned that tensile circumferential strain is achieved during the first half cycle, while within the second half cycle compression circumferential strain is gained. In this process, the overall accumulated plastic strain can be calculated based on the number of passes, channel angles, and curvature angles (Mesbah et al, 2019), where equivalent plastic strains of 1.8 and 5.4 were specified following the first and third passes of PTCAP, respectively. On the other hand, various problematic clinical situations can be addressed by the expansion of novel concepts, instruments, and medical implant design for surgical trials and exploration in orthopedics-traumatology.…”

“…Several SPD processes, such as accumulative roll bonding (ARB) (Rao et al, 2019), high-pressure torsion (HPT) (Figueiredo and Langdon, 2019), equal channel angular pressing (ECAP) (Martynenko et al, 2019), and tubular channel angular pressing (TCAP) (Reshadi et al, 2015) are introduced as encouraging approaches for fabricating UFGs Mg-based alloys. Aside from these common methods, PTCAP is also made known as a new SPD technique for the fabrication of UFGs and nanostructured tubes, in which the deformation entails two half-cycles that are affected by a range of processing parameters involving deformation ratio, curvature angle and channel angle (Kasaeian-Naeini et al, 2019;Mesbah et al, 2016a;Mesbah et al, 2019). However, considering the multifarious factors of the SPD techniques with nonlinear interrelations, an accurate determination of the material features necessitates a large number of tests, which is not industrially and commercially cost-effective (Mesbah, 2013;Mesbah et al, 2014;Mesbah et al, 2016b;Wang et al, 2020).…”

“…It should be noted that further details on input and output variables can be found in the literature (Dumitru et al, 2014;He et al, 2010;Mostaed et al, 2014;Orlov et al, 2011;Vinogradov, 2017). Figure 4 shows the radar charts of the mechanical properties (δ (%), σYS (MPa), and σUTS (MPa)) of the SPD-processed biodegradable ZK60 Mg alloy based on the used dataset, which is collected from our previous work (Mesbah et al, 2019) and the relevant literature (Dumitru et al, 2014;He et al, 2010;Mostaed et al, 2014;Orlov et al, 2011;Vinogradov, 2017). The corresponding dataset is summarized in Table 2.…”

“…Table 2. The collected dataset from our prior findings (Mesbah et al, 2019) and the literature (Dumitru et al, 2014;He et al, 2010;Mostaed et al, 2014;Orlov et al, 2011;Vinogradov, 2017). (Dumitru et al, 2014;He et al, 2010;Mostaed et al, 2014;Orlov et al, 2011;Vinogradov, 2017) 1 PTCAP parallel tubular-channel angular pressing; 2 ECAP equal channel angular pressing; 3 HRDSR high-ratio differential speed rolling…”