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Metals 2017, 7(6), 212; doi:10.3390/met7060212

Fatigue Behavior of the Rare Earth Rich EV31A Mg Alloy: Influence of Plasma Electrolytic Oxidation

1
Department of Industrial Engineering (DIN), Alma Mater Studiorum-University of Bologna, 40136 Bologna, Italy
2
Ducati Motor Holding, 40132 Bologna, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Gilbert Henaff
Received: 30 April 2017 / Revised: 24 May 2017 / Accepted: 31 May 2017 / Published: 8 June 2017
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Abstract

Rare earth rich magnesium alloys are used in aerospace and automotive fields because of their high specific strength and good castability. However, due to their low corrosion resistance, protective surface treatments, such as conversion coating or electroless plating are necessary, when they have to be used in humid or corrosive environments. The present study was aimed at evaluating the effect of plasma electrolytic oxidation (PEO) and different surface roughness (Ra ≈ 0.8 μm and Ra ≈ 0.3 μm) on the rotating bending fatigue of an innovative Mg alloy, with a high content of Nd (up to 3.1 wt %) and Gd (up to 1.7 wt %). Fatigue tests revealed a 15% decrease in the fatigue strength of the PEO-treated alloy (fatigue strength = 88 MPa) with respect to the bare alloy (fatigue strength = 103 MPa). The reduction of fatigue strength was mainly due to the residual tensile stresses induced by the PEO treatment. The effect of surface roughness on the bare alloy was, instead, negligible. The mechanisms of crack initiation were similar in the untreated and PEO-treated alloy, with crack nucleation sites located in correspondence to large facets of the cleavage planes. View Full-Text
Keywords: rare earth rich magnesium alloy; plasma electrolytic oxidation, PEO; microstructure; fatigue behaviour rare earth rich magnesium alloy; plasma electrolytic oxidation, PEO; microstructure; fatigue behaviour
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MDPI and ACS Style

Ceschini, L.; Morri, A.; Angelini, V.; Messieri, S. Fatigue Behavior of the Rare Earth Rich EV31A Mg Alloy: Influence of Plasma Electrolytic Oxidation. Metals 2017, 7, 212.

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