Nurşen SAKLAKOĞLU, Hakan ÇOLAKOGLU, Simge GENÇALP

SIMA prosesi ile üretilmiş Al-4Zn-3Mg alaşımında mikroyapı gelişimi elisimi

Bu makalede, Al-4Zn-3Mg alasımının SIMA prosesi ile yarı-katı halde mikroskobik morfolojisi incelenmis ve ön deformasyonun etkileri, mikroyapısal gelisim ve sertlik degisimleri belirlenmistir. Deney sonuçları göstermistir ki, tane yapısı homojen olmayan ön deformasyon nedeniyle malzemenin kenarından merkezine farklılıklar göstermistir ve izotermal ısıl islemler malzemenin sertligini azaltmıstır.

Microstructural evolution of Al-4Zn-3Mg alloy produced by SIMA process

In this paper, the microscopic morphology of a semi solid Al-4Zn-3Mg alloy by strain induced melt activated (SIMA) process were investigated, and the effects of predeformation, microstructural evolution and hardness changes were determined. The experimental results showed that the grain structure exhibited the diffrence from the edge to the center of the sample because of non-uniform predeformation and isothermal heat treatments reduced hardness of material.

PDF

___

1. Merton C. Flemings, Behavior of metal alloys in the semisolid state, Metalurgicall Transactions, V. 22B (1991), pp. 269–293.
2. P. Kapranos, Semi-solid metal processing: an environmentally friendly process, Materials World (September 1994), 465–467.
3. Haitao Jiang and Miaoquan Li, Microscopic observation of cold-deformed Al–4Cu–Mg alloy samples after semi-solid heat treatments, Materials Characterization, Volume 54, Issues 4-5, May 2005, Pages 451-457
4. J.G. Wang, H.Q. Lin, Y.Q. Li and Q.C. Jiang, Effect of initial as-cast microstructure on semisolid microstructure of AZ91D alloy during the strain-induced melt activation process, Journal of Alloys and Compounds, Article in Press, Corrected Prof, Volume 457, 2008, Pages 251-258
5. Nursen Saklakoglu, I. Etem Saklakoglu, Metin Tanoglu, Ozgu Oztas and Onder Cubukcuoglu, Mechanical properties and microstructural evaluation of AA5013 aluminum alloy treated in the semi-solid state by SIMA process, Journal of Materials Processing Technology, Volume 148, Issue 1, 1 May 2004, Pages 103-107
6. A. Turkeli, N. Akbas, Formation of non-dendritic structure in 7075 wrought aluminum alloy by SIMA process and effect of heat treatment, in: Proceedings of the Fourth International Conference on Semi-solid Processing of Alloys and Composites, Sheffield, UK, 1996, pp. 71–74.
7. Yu Sirong, Li Dongcheng and N. Kim, Microstructure evolution of SIMA processed Al2024, Materials Science and Engineering: A, Volume 420, Issues 1-2, 25 March 2006, Pages 165-170
8. Haitao Jiang and Miaoquan Li, Grain growth of Al-4Cu-Mg alloy during isothermal heat treatment Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material, Volume 13, Issue 1, February 2006, Pages 67-72
9. Jae Chan Choi and Hyung Jin Park, Microstructural characteristics of aluminum 2024 by cold working in the SIMA process, Journal of Materials Processing Technology, Volume 82, Issues 1- 3, 1 October 1998, Pages 107-116
10. Metals Handbook, Forming and forging, 9. Edition, V.14 ASM International
11. P.L. Mangonon, The Principles of Materials Selection for Engineering Design, Prentice-Hall Inc. 999) ISBN 0-13-242595-5.