Effects of Homogenization on Microstructure and Mechanical Properties of a ZE20 Mg Alloy Processed by Indirect Extrusion

McClelland, Z.; Li, B.; Horstemeyer, S.J.; Horstemeyer, Mark F.; Oppedal, A.L.

doi:10.1007/978-3-319-48114-2_28

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“…After the optimum two-step homogenization treatment, the coarse irregular phase MgZn 2 is dissolved into the matrix and the heat-resistant phase CaMgSn is gradually dissolved from long strip-like into short rod-like and dot-like without obvious grain growth, so the crack-initiation is reduced. Therefore, the reasonable homogenization treatment can dissolve undesirable large second phases, eliminate the micro-segregation, and achieve a more uniform microstructure, which contributes to increasing the elongation of the as-homogenized alloy [ 41 ]. At the same time, homogenization treatment dissolves the low-melting-point phase MgZn 2 and changes the morphology of heat-resistant phase CaMgSn, thus reducing the pinning effect of the second phase on dislocation motion and lowering the yield strength of the as-homogenized alloy [ 42 , 43 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Mechanical Properties of the As-Cast and As-Homogenized Mg-Zn-Sn-Mn-Ca Alloy Fabricated by Semicontinuous Casting

et al. 2018

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In this paper, a new type of low-cost Mg-3.36Zn-1.06Sn-0.33Mn-0.27Ca (wt %) alloy ingot with a diameter of 130 mm and a length of 4800 mm was fabricated by semicontinuous casting. The microstructure and mechanical properties at different areas of the ingot were investigated. The microstructure and mechanical properties of the alloy under different one-step and two-step homogenization conditions were studied. For the as-cast alloy, the average grain size and the second phase size decrease from the center to the surface of the ingot, while the area fraction of the second phase increases gradually. At one-half of the radius of the ingot, the alloy presents the optimum comprehensive mechanical properties along the axial direction, which is attributed to the combined effect of relatively small grain size, low second-phase fraction, and uniform microstructure. For the as-homogenized alloy, the optimum two-step homogenization process parameters were determined as 340 °C × 10 h + 520 °C × 16 h. After the optimum homogenization, the proper size and morphology of CaMgSn phase are conducive to improve the microstructure uniformity and the mechanical properties of the alloy. Besides, the yield strength of the alloy is reduced by 20.7% and the elongation is increased by 56.3%, which is more favorable for the subsequent hot deformation processing.

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Section: Resultsmentioning

confidence: 99%