Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5454878 | Materials Characterization | 2017 | 20 Pages |
Abstract
The microstructure of the 95 wt%Zn-2.3 wt%Al-2.7 wt%Mg bulk alloy used for hot-dip galvanization has been investigated by TEM and SEM. The alloy exhibits a multi-scales and multi-phases microstructure. The dendrite and the granular/lamellar region are observed at hundreds-micron scale, and each has finer details. The dendrite is composed of the coarse hcp-Zn grains, with MgZn2 grains between the branches, and some individual bulk MgZn2. The granular/lamellar region has a complex ternary eutectic morphology, containing the hcp-Zn lamellas, the monotectoid product of Al-bubble wrapping Zn-granule, and the Zn-Mg lamellas, and the dimension of every unit is less than 1 μm. The hcp-Zn phase, in the form of coarse grains and lamellas, is supersaturated, with numerous platelet Al precipitation about tens of nanometers inside, with the orientation relationship of (0 0 1)Al//(0 0 0 1)Zn, and [1 1 0]Al near 112¯0Zn. The Zn-Mg lamella is a MgZn2 matrix with polygon Mg2Zn11 precipitates less than 100 nm and some Mg segregations.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Yang MENG, Guangrui JIANG, Xinhua JU, Jingli HAO,