Effect of Secondary Ageing Treatment on Some Mechanical Properties of AlSi10Mg Casting Alloys

Abstract

In this paper, effect of secondary ageing process on the hardness and the abrasive wear resistance of AlSi10Mg casting alloys was studied. In the T6 temper heat treatment, AlSi10Mg alloy was aged at 170 ˚C for 4 hours. In secondary ageing process, AlSi10Mg alloy aged at 170 ˚C for 10 or 30 minutes was re-aged at 100 ˚C for 135 hours. Abrasive wear tests were performed on pin-on disk abrasive wear tester under 20 N and 30 N loads and 180 Mesh abrasive papers and at the sliding speed of 0.2 ms-1. Abrasive wear test results revealed that specimen aged at 170 ˚C for 30 minutes and then re-aged at 100 ˚C for 135 hours has the highest abrasive wear resistance

Keywords

• Abrasive wear
• Secondary ageing
• Hardness
• Microstructure

AlSi10Mg Döküm Alaşımlarının Bazı Mekanik Özellikleri Üzerine İkincil Yaşlandırma İşleminin Etkisi

Abstract

Bu çalışmada AlSi10Mg alaşımının ikincil yaşlandırma prosesinin sertlik ve abrasif aşınma direncine etkisi araştırılmıştır. T6 ısıl işleminde Al10SiMg alaşımı numuneler 170 ËšC'de 4 saat yaşlandırılmıştır. İkincil yaşlandırma işleminde 170 ËšC'de 10 ve 30 dakika yaşlandırılmış olan numuneler 100 ËšC'de 135 saat yeniden yaşlandırılmıştır. Abrasif aşınma testleri, pin on disk abrasif aşınma test cihazında 180 Mesh zımpara, 20 ve 30 N yük altında 0.2 ms-1 kayma hızında gerçekleştirilmiştir. Abrasif aşınma test sonuçları, 170 ËšC'de 30 dk yaşlandırılan, ardından 100 ËšC'de 135 saat yeniden yaşlandırma işlemi yapılan numunenin, en yüksek abrasif aşınma direncine sahip olduğunu ortaya koymaktadır.

Keywords

• Abrasif aşınma
• İkincil yaşlandırma
• Sertlik
• Mikroyapı

References

1. Ammar H.R., Moreau C., Samuel A.M., Samuel F.H., Doty H.W., 2008. Influences of alloying elements, solution treatment time and quenching media on quality indices of 413-type Al–Si casting alloys,
2. Materials Science and Engineering A 489, 426–438 Anesh, S.R., Dwivedi, D.K., 2007. Solutionizing temperature and abrasive wear behaviour of cast Al–
3. Si–Mg alloys” Materials and Design 28, 1975–1981
4. Buha J., Lumley R.N., and Crosky A.G., 2006.
5. Microstructural Development and Mechanical Properties of Interrupted Aged Al-Mg-Si-Cu Alloy, Metallurgical and Metarials Transactions A Vol 37 A, 3119- 3130
6. Buha J., Lumley R.N., Crosky A.G., Hono K., 2007.
7. Secondary precipitation in an Al–Mg–Si–Cu alloy,” Acta Materialia 55, 3015–3024
8. Buha J., Lumley R.N., Crosky A.G., 2008. Secondary ageing in an aluminium alloy 7050, Materials Science and Engineering A 492, 1–10

9. Cao X. and Campbell, J., 2006. Morphology of β
10. Al5FeSi Phase in Al-Si Cast Alloys, Materials Transactions, Vol. 47, No. 5 pp. 1303 - 1312
11. Gao, N., Starink, M. J., Kamp, N. Sinclair, I., 2007.
12. Application of uniform design in optimisation of three stage ageing of Al–Cu–Mg alloys, J Mater Sci 42, pp 4398–4405
13. Hwang J.Y., Doty H.W., Kaufman M.J., 2008. The effects of Mn additions on the microstructure and mechanical properties of Al–Si–Cu casting alloys”
14. Materials Science and Engineering A 488, 496–504 Imurai, S., Kajornchaiyakul, J., Thanachayanont, C, Pearce, J.T.H., Chairuangsri, T., 2010. Age Hardening and Precipitation Behavior of an Experimental Cast
15. Al-Mg-Si Alloy Treated by T6 and T6I6 Heat Treatments. Chiang Mai J. Sci, 37(2) : 269-281
16. Li R.X., Li R.D., Zhao Y.H., He L.Z., Li C.X., Guan H.R., Hu Z.Q., 2004. Age-hardening behavior of cast Al–Si base alloy, Materials Letters 58, 2096–2101
17. Lumley R.N., Polmear I.J., Morton A.J., 2004, Temper
18. Developments Using Secondary Ageing, Materials Forum Volume 28, 85-95
19. Marceau R.K.W., Sha G., Lumley R.N., Ringer S.P., 20 Evolution of solute clustering in Al–Cu–Mg alloys during secondary ageing, Acta Materialia 58, 1795–1805
20. Mohamed, A.M.A. Samuel, A.M. Samuel, F.H. Doty, H.W. 2009. Influence of additives on the microstructure and tensile properties of near- eutectic Al–10.8%Si cast alloy, Materials and Design 30, 3943–3957.
21. Moller H.M., Govender, G. Stumpf, W.E., Pistorius, P.C., 20 Comparison of heat treatment response of semisolid metal processed alloys A356 and F357, International Journal of Cast Metals Research Vol 23, No 1 pp 37-43
22. Risanti D.D., Yin M., Rivera P.E.J. Díaz del Castillo, Zwaag S. van der, 2009. A systematic study of the effect of interrupted ageing conditions on the strength and toughness development of AA6061,
23. Materials Science and Engineering A 523, 99–111 Shah, K.B. Kumar, S. Dwivedi D.K. 2007. Aging temperature and abrasive wear behaviour of cast Al–
24. (4%,12%,20%)Si–0.3% Mg alloys, Materials and Design 28 1968–1974
25. Sharma, R. Anesh, D.K. Dwivedi, 2005. Influence of silicon (wt.%) and heat treatment on abrasive wear behaviour of cast Al–Si–Mg alloys, Materials Science and Engineering A 408, 274–280
26. Sjölander, E., Seifeddine, S., 2010. The heat treatment of Al–Si–Cu–Mg casting alloys, Journal of Materials
27. Processing Technology 210, 1249–1259