Hot deformation mechanisms, microstructure and texture evolution in extruded AZ31–nano-alumina composite
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Pages (from-to) | 41-49 |
Journal / Publication | Materials Science and Engineering A |
Volume | 589 |
Online published | 25 Sept 2013 |
Publication status | Published - 1 Jan 2014 |
Link(s)
Abstract
Processing map for hot working of hot extruded AZ31–1.5 vol% nano-alumina magnesium composite (AZ31–NAL) prepared by disintegrated metal deposition (DMD) technique has been developed in the temperature range of 250–500 °C and strain rate range of 0.0003–10 s−1. The starting composite microstructure is fine grained and is much less textured compared with the base AZ31 material prepared by similar technique (AZ31–DMD). The processing map for the composite exhibits three domains in the temperature and strain rate ranges: (1) 250–350 °C/0.0003–0.01 s−1; (2) 375–500 °C/0.0003–0.01 s−1; (3) 300–400 °C/1–10 s−1, which are all similar to those exhibited by the base alloy. In Domains #1 and #3, dynamic recrystallization occurs and results in fine grained microstructure, while in Domain #2, grain boundary sliding leading to wedge cracking in compression and intercrystalline cracking in tension have been identified. In comparison with the base alloy AZ31–DMD, the efficiency in the first domain has decreased, the third domain moved to lower temperatures and the effect on second domain is marginal. These differences are attributed to the lower intensity of starting texture in the nano-composite compared with the base alloy. A study of texture changes in the deformed specimens revealed that nano-alumina additions are helpful in reducing the preferred orientation in AZ31 alloy.
Research Area(s)
- AZ31 magnesium alloy, Hot deformation, Microstructure, Nano-alumina composite, Processing map, Texture
Citation Format(s)
Hot deformation mechanisms, microstructure and texture evolution in extruded AZ31–nano-alumina composite. / Zhong, T.; Rao, K. P.; Prasad, Y. V R K et al.
In: Materials Science and Engineering A, Vol. 589, 01.01.2014, p. 41-49.
In: Materials Science and Engineering A, Vol. 589, 01.01.2014, p. 41-49.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review