NDLI: Precipitation hardening of Zr-modified Mg–Ca

Content Provider	Springer Nature Link
Author	Shepelev, D. Bamberger, M. Katsman, A.
Copyright Year	2009
Abstract	The microstructure and mechanical properties of Mg–Ca–Zn alloys with 1 wt.% Zr were investigated in as-cast and heat-treated conditions. A substantial decrease in grain size (from 65 µm for the Mg–Ca–Zn base alloy to 22 µm) was observed. The alloy was solution treated at 410 °C for up to 96 h followed by aging at 175 °C for up to 24 h. Conventional techniques, X-ray diffraction, EM + EDS, and TEM were used to characterize the microstructure of the alloy. The microstructure obtained after heat treatment had equiaxed grains with evenly distributed binary phase Zn$_{2}$Zr. The binary Mg$_{2}$Ca and ternary Mg$_{2}$Ca$_{6}$Zn$_{3}$ phases were identified in the matrix and at grain boundaries surrounded by precipitate-depleted zones (PDZs). The thermal stability of the Zr-modified alloys was examined by microhardness measurements conducted after prolonged exposures of the alloys to elevated temperatures. It was found that Zr is a structure-stabilizing factor. Its influence was associated with the formation of Zn$_{2}$Zr phase that does not undergo coarsening at the elevated temperatures used (due to the low diffusivity of Zr). The nanoscale mechanical properties of grain boundary PDZs were analyzed using combined nanoindentation and atomic force microscopy. These mechanical properties were then correlated to the composition and precipitate distribution in PDZs. An increase in the solution treatment duration from 10 to 96 h at 410 °C resulted in expansion of PDZs from ~0.75 to ~3 µm, while the following aging at 175 °C for up to 24 h did not lead to a detectable change in PDZs. The analysis indicates that the lowest hardness was found in the region where Zn$_{2}$Zr precipitates density was low, regardless of the solute concentration.
Starting Page	5627
Ending Page	5635
Page Count	9
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	44
Issue Number	20
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2009-08-14
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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