Tensile and High-Cycle Fatigue Properties of Extruded AZ91–0.3Ca–0.2Y Alloy with Excellent Corrosion and Ignition Resistances

다국어 초록 (Multilingual Abstract)

Mg–Al–Zn–Ca–Y (SEN) alloys have been recently developed by adding small amounts of Ca and Y to commercial Mg–Al–Zn (AZ series) alloys. These alloys possess superior corrosion and ignition resistances to their commercial AZ seriescounterparts. Here, commercial AZ91 (Mg–9Al–0.8Zn, wt%) and developed SEN9 (Mg–9Al–0.8Zn–0.3Ca–0.2Y, wt%)alloys are extruded under the same conditions, and the microstructure, tensile properties, and high-cycle fatigue propertiesof the extruded alloys are compared. The extruded SEN9 alloy has a smaller average grain size and higher microstructuralhomogeneity than the extruded AZ91 alloy because the Al2Y,Al2Ca,and Al8Mn4Yparticles in the homogenized SEN9 billetpromote dynamic recrystallization during extrusion. Despite their different microstructures, the two alloys possess similartensile strengths because the strong precipitation hardening in the extruded AZ91 alloy is offset by strong grain-boundaryhardening in the extruded SEN9 alloy. However, the extruded SEN9 alloy exhibits higher tensile elongation because deformationtwinning is suppressed by the finer grains. The fatigue strength of the extruded SEN9 alloy (100 MPa) is slightlylower than that of the extruded AZ91 alloy (110 MPa). For the extruded AZ91 alloy, fatigue cracks initiate on the surfacein all specimens, whereas for the extruded SEN9 alloy, fatigue cracks initiate in an Al2Caor Al2Yparticle present on thesubsurface in some specimens, especially at low stress amplitudes. The Al2Caand Al2Yparticles are larger than the Mg17Al12precipitates, and considerably harder than the matrix. Consequently, local stress is highly concentrated in these particlesduring cyclic loading, which eventually causes premature fatigue cracking and decreased fatigue resistance.

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