Browse > Article
http://dx.doi.org/10.3740/MRSK.2014.24.10.538

Microstructure and Mechanical Properties on Solid Solution Heat Treatment of Al-6Si-2Cu Alloy for Lightweight Automotive  

Hong, Seung-Pyo (Department of Materials Science and Engineering, Chosun University)
Kim, Chung-Seok (Department of Materials Science and Engineering, Chosun University)
Publication Information
Korean Journal of Materials Research / v.24, no.10, 2014 , pp. 538-542 More about this Journal
Abstract
Microstructural and mechanical characteristics of Al-6Si-2Cu alloy for lightweight automotive parts were investigated. The test specimens were prepared by gravity casting process. Solution heat treatments were applied to as-cast alloys to improve mechanical properties. The microstructure of the gravity casting specimen presents a typical dendrite structure, having a secondary dendrite arm spacing (SDAS) of $37{\mu}m$. In addition to the Al matrix, a large amount of coarsened eutectic Si, $Al_2Cu$ intermetallic phase, and Fe-rich phases were identified. After solution heat treatment, single-step solution heat treatments were found to considerably improve the spheroidization of the eutectic Si phase. Two-step solution treatments gave rise to a much improved spheroidization. The mechanical properties of the two-step solution heat treated alloy have been shown to lead to higher values of properties such as tensile strength and microhardness. Consequentially, the microstructural and mechanical characteristics of Al alloy have been successfully characterized and are available for use with other basic data for the development of lightweight automotive parts.
Keywords
Al-Si-Cu alloy; solution heat treatment; spheroidization; lightweight automotive;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 K. Sasaki and T. Takahashi, Int. J. Fatigue., 28, 203 (2006).   DOI
2 B. M. A. Alawi and T. H. Bradley, Appl. Energ., 113, 1323 (2014).   DOI
3 K. T. Kim, J. Korea Foundry Soc., 31, 101 (2011) (in Korean).   DOI
4 L. Ceschini, A. Morri, A. Morri and G. Pivetti, Mater. Design, 32, 1367 (2011).   DOI
5 E. H. Samuel, A. M. Samuel and H. W. Doty, AFS Trans., 30, 839 (1996).
6 Z. Li, A. M. Samuel, F. H. Samuel, C. Ravindran and S. Valtierra, J. Mater. Sci., 116, 1203 (2003).
7 E. Sj lander and S. Seifeddine, Mater. Design., 31, 44 (2010).   DOI
8 T. Nishimura, H. Toda, M. Kobayashi, T. Kobayashi, K. Uesugi and Y. Suzuki, Int. J. Cast Metal. Res., 21 114 (2008).   DOI
9 Y. J. Li, S. Brusethaug and A. Olsen, Scripta. Mater., 54, 99 (2006).   DOI
10 I. A. Luna, H. M. Molinar, M. J. C. Roman, J. C. E. Bocardo and M. H. Trejo, Mater. Sci. Eng. A., 561, 1 (2013).   DOI
11 L. Ceschini, I. Boromei, A. Morri, S. Seifeddine and I. L. Svensson, J. Mater. Process. Tech., 209, 5669 (2009).   DOI   ScienceOn
12 M. Zeren, E. Karakulak and S. Gumus, Trans. Nonferrous Met. Soc. China, 21, 1698 (2011).   DOI
13 L. Ceschini, I. Boromei, A. Morri, S. Seifeddine and I. L. Svensson, Mater. Design, 36, 522 (2012)   DOI