Abstract
AZ31-based nanocomposites are produced by disintegrated melt deposition (DMD) processing. In this investigation, the influence of the addition of Ca to AZ31-1.5 vol.% nano-alumina composite (base) on its hot working behavior is studied to develop a processing route for manufacturing components with these composites. A processing map for the base composite in the temperature range 250–500 °C and strain rate 0.0003–10 s−1 is compared with those for composites with 1% Ca and 2% Ca. The grain size of the base composite is refined by Ca addition and the <10 1 ¯ 0> texture is strengthened. Besides nano-alumina particles, the Ca-containing composites have intermetallic particles (Mg,Al)2Ca present at grain boundaries as well as in the matrix. All the three nanocomposites exhibit three DRX domains, with one of them at high strain rate that facilitates high productivity. Addition of Ca mitigates the occurrence of wedge cracking that occurs in AZ31-1.5NAl composite. Increasing of Ca addition to 2% prevents dynamic recrystallization (DRX) at lower temperatures and strain rates and causes only dynamic recovery. At lower temperatures and higher strain rates, DRX occurs by basal + prismatic slip along with recovery via climb controlled by grain boundary self-diffusion promoted by very fine grain size in the composites.
Highlights
A light weight of Mg materials is sought after for many automobile, aerospace, and biomedical applications [1]
AZ31-1.5NAl-1Ca, and AZ31-1.5NAl-2Ca composites are shown in Figure 1a–c. (Mg,Al)
The effect of 1% and 2% Ca on the hot working behavior of AZ31-1.5 vol.% nano-alumina composite produced by disintegrated melt deposition (DMD) processing has been investigated by developing processing maps in the temperature range 250–500 ◦ C and strain rate 0.0003–10 s−1
Summary
A light weight of Mg materials is sought after for many automobile, aerospace, and biomedical applications [1]. With a view to enhance the strength of AZ31, several nanodispersions have been attempted [3,4,5,6,7,8] and AZ31-nano-alumina composites are studied in detail [4,5]. The effect of Al2 O3 -nanoparticles as the reinforcement additive on the hot deformation behavior of aluminum alloy (AA7075) has been studied [6]. AZ31-1 vol.% SiC nanocomposites have been fabricated by hot rolling with pre-extrusion [7] and the nanocomposite. Metals 2018, 8, 699 sheets have exhibited significantly enhanced tensile strength and uniform mechanical properties during subsequent rolling. An attempt [8] has been made to reinforce SiC nanoparticles into as-cast AZ91
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