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Effect of roller burnishing on fatigue properties of the hot-rolled Mg-12Gd-3Y magnesium alloy

: Zhang, P.; Lindemann, J.; Ding, W.J.; Leyens, C.


Materials chemistry and physics 124 (2010), Nr.1, S.835-840
ISSN: 0254-0584
Fraunhofer IWS ()

Influence of roller burnishing (RB) on high cycle fatigue properties of the hot-rolled Mg-12Gd-3Y (wt.%) magnesium alloy was investigated. RB can significantly improve the fatigue life of the Mg-12Gd-3Y alloy. After RB, the fatigue strength (at 10(7) cycles) in the as-rolled alloy and the aging heat-treated (T5-treated) specimens increased from 150 and 155 MPa, to 225 and 210 MPa, respectively. RB led to a subsurface fatigue-crack nucleation in both the as-rolled and the 15-treated materials. In the as-rolled alloy, small cracks (in the stage I) propagated along cleavage planes after RB. In contrast, in the 15-treated specimens, the small cracks grew by coalescence of the sheared dimples. RB introduced a work-hardened case and compressive residual stresses in the near-surface region, which effectively retarded the fatigue-crack nucleation and/or propagation, leading to an improvement in fatigue life.