Abstract
The morphology and crystallography of unidirectionally solidified Zn-Al eutectic has been studied by optical and electron metallography and Laue back-reflection X-ray analysis. A preferred orientation relationship between the Zn-rich and Al-rich phases has been determined from analysis of Kikuchi line patterns obtained simultaneously from both phases and found to be: (0001)Zn // (111)Al // habit plane, <1 2 10>Zn // <1 1 0>Al ≃ // growth direction. Eutectic grains were found to rotate at rates of up to 4° per mm and both left and right hand rotations were observed. The interface plane in both left handed and right handed rotating lamellar grains lies on <5 1 4 0> zones and does not contain the growth direction which is very close to <1210>. Current ideas of rotation mechanisms are reviewed, no theory being found satisfactory. The precipitation of Zn in the Al-rich lamellae due to the monotectoid reaction has also been investigated by electron metallography.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
