Microstructural change and precipitation hardening in melt-spun Mg-X-Ca alloys
- Authors
- Park, Won-Wook; You, Bong-Sun; Moon, Byoung-Gi; Kim, Wan-Chul
- Issue Date
- 2001
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- Mg-Al-Si-Ca; Mg-Zn-Ca; Melt spinning; Age hardening; Precipitation
- Citation
- SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, v.2, no.1, pp.73 - 78
- Journal Title
- SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
- Volume
- 2
- Number
- 1
- Start Page
- 73
- End Page
- 78
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/27292
- DOI
- 10.1016/S1468-6996(01)00028-6
- ISSN
- 1468-6996
- Abstract
- Mg-Al-Si-Ca and Mg-Zn-Ca base alloys were rapidly solidified by melt spinning at the cooling rate of about a million K/s. The melt spun ribbons were aged in the range 100-400 degrees C for 1 h. The effect of additional elements on microstructural change and precipitation hardening after heat treatment was investigated using TEM, XRD and a Vickers microhardness tester. Age hardening occurred after aging at 200 degrees C in the Mg-Al-Si-Ca alloys mainly due to the formation of Al2Ca and Mg2Ca phases, whereas in the Mg-Zn-Ca alloys mostly due to the distribution of Mg2Ca. TEM results revealed that spherical Al2Ca precipitate has the coherent interface with the matrix. Considering the total amount of additional elements, Mg-Zn-Ca alloys showed higher hardness and smaller size of precipitates than Mg-Al-Si-Ca alloys. With the increase of Ca content, the hardness values of the aged ribbons were increased. Among the alloys, Mg-6Zn-5Ca alloy showed the maximum value of age hardening peak(H-v:180) after aging at 200 degrees C for 1 h. (C) 2001 Published by Elsevier Science Ltd.
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