In the present research, friction stir processing (FSP) of as-cast AZ91-D Mg-alloy has been done to improve its ultimate tensile strength (UTS). Taguchi's L-9 orthogonal array was used to optimize the process parameters for improving the UTS of AZ91-D parent material (PM). The optimum levels of process parameters were found to be 1000 rpm, 50 mm min −1 and 6 passes for the rotational tool speed, transverse speed and a number of passes of FSP, respectively. As per ANOVA results, the number of passes has the highest statistical effect of about 41.3 % on UTS.Additionally, the micro-hardness tests were conducted to confirm the process optimization. The FSPed material with optimized parameters showed an enhancement of 24.56 and 77.5 % in UTS and micro-hardness as compared to PM respectively. The grain size of FSPed material was observed to be 6.88 times lesser than PM. Microstructure evaluation of optimized FSPed material also confirmed the uniform dispersion of β-phase (Mg17Al12) resulting in improved properties.
The bio-implant devices require adequate strength and low elastic modulus, for compatibility with human bone. In this study, the near-beta Ti–13Nb–13Zr alloy was subjected to two different solutionising temperatures and quenched at different temperatures. Microstructure modifications and its influence on microhardness, elastic modulus and tensile properties were investigated. Elastic modulus was decreased with increase in cooling rate from solutioning temperature. The samples solutionised at 900°C and quenched at sub-zero temperature contained α″ martensite along with α′ and β phases and these lowered the elastic modulus. Among all the heat-treated samples, the one solutionised at 900°C and quenched at sub-zero exhibited lowest elastic modulus of 59 GPa and adequate tensile properties for the application as bioimplants.
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