[Kovove materialy - Metallic materials]
    Mon - January 25, 2021 - 14:38 No. of hits : 1227828 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 57 (2019), Issue 3

Microstructure and mechanical behaviour of friction stir processed AZ91-D magnesium alloy – optimization of process parameters by using the Taguchi method
KUMAR, P., THAKUR, L., BHADOURIA, N., DIXIT, S.
vol. 57 (2019), no. 3, pp. 207 - 217

Abstract
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.

Key words
magnesium, friction stir processing, Taguchi, tensile strength, micro-hardness, dynamic recrystallization

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.


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