Effect of rapid solidification aluminum alloys with different Si content on mechanical properties and microstructure
DOI:
https://doi.org/10.7494/mafe.2016.42.3.179Keywords:
solid bonding, rapid solidification, hot extrusionAbstract
Rapid solidification is a relatively new and effective way of ultrafine grained UFG aluminum alloys production with enhanced mechanical properties. Due to significant cooling rate close to almost 106 K/s it is possible to obtain material with grain size far below 100 nm. In the present study RS aluminum alloys with Si content in a range of 5-10 wt.% were produced during melt spinning. As a result, materials in a form of ribbons were produced. As-received flakes were subjected to cold pressing into a cylindrical billets with diameter of 40 mm. Hot extrusion of pre-compacted material was subsequently performed at the temperature of 450 °C with press ram speed of 3 mm/s and extrusion ratio of λ=25. In this work influence of brittle phases on mechanical properties of as-extruded rods will be examined. Both tensile and microhardness tests were performed in order to determine mechanical properties of obtained profiles. It has been showed that brittle phases refinement during melt spinning significantly influences mechanical properties of tested materials.
Downloads
References
Ye H.: An Overview of the Development of Al-Si-Alloy Based Material for Engine Applications. Journal of Materials Engineering and Performance, 12, 3 (2003), 288–297
Srivastava V.C., Mandal R.K., Ojha S.N., Venkateswarlu K.: Microstructural modifications induced during spray deposition of Al-Si-Fe alloys and their mechanical properties. Materials Science and Engineering A, 471, 1–2, (2007), 38–49
Todeschini P., Champier G., Samuel F.H.: Production of Al-(12-25) wt % Si alloys by rapid solidification: melt-spinning versus centrifugal atomization. Journal of Materials Science, 27 (1992), 3539–3551
Xu C.L., Wang H.Y., Qiu F., Yang Y.F., Jiang Q.C.: Cooling rate and microstructure of rapidly solidified Al-20wt% Si alloy. Materials Science Engineering A, 417, 1–2 (2006), 275–280
Misiolek W.Z., Haase M., Khalifa N.B., Tekkaya A.E., Kleiner M.: High quality extrudates from aluminum chips by new billet compaction and deformation routes. CIRP Annals – Manufacturing Technology, 61, 1 (2012), 239–242
Van Rooyen M., Colijn P.F., de Keijser T.H., Mittemeijer E.J.: Morphology and mechanical properties of melt-spun and conventionally cast aluminium, AlMg and AlSi alloys before and after hot extrusion. Journal of Materials Science, 21 (1986), 2373–2384
Barekar N.S., Hari Babu N., Dhindaw B.K., Fan Z.: Effect of intensive shearing on morphology of primary silicon and properties of hypereutectic Al-Si alloy. Materials Science and Technology, 26, 8 (2010), 975–980
Sheng S.D., Chen D., Chen Z.H.: Effects of Si addition on microstructure and mechanical properties of RS/PM (rapid solidification and powder metallurgy) AZ91 alloy. Journal of Alloys and Compounds, 470, 1–2 (2009), 17–20
Tawfik N.L.: Mechanical properties of rapidly solidified ribbons of some Al-Si based alloys. Journal of Materials Science, 32, 11 (1997), 2997–3000
Haase M., Ben Khalifa N., Tekkaya A.E., Misiolek W.Z.: Improving mechanical properties of chip-based aluminum extrudates by integrated extrusion and equal channel angular pressing (iECAP). Materials Science and Engineering A, 539 (2012), 194–204
Nikanorov S.P., Volkov M.P., Gurin V.N., Burenkov Y.A., Derkachenko L.I., Kardashev B.K., Regel L.L., Wilcox W.R.: Structural and mechanical properties of Al-Si alloys obtained by fast cooling of a levitated melt. Materials Science and Engineering A, 390, 1–2 (2005), 63–69
Zhang Y., Liu Y., Han Y., Wei C., Gao Z.: The role of cooling rate in the microstructure of Al-Fe-Si alloy with high Fe and Si contents. Journal of Alloys and Compounds, 473, 1–2 (2009), 442–445
Dutta B., Rettenmayr M.: Effect of cooling rate on the solidification behaviour of Al-Fe-Si alloys. Materials Science and Engineering A, 283 (2000), 218–224
Griger A., Stefaniay V.: Equilibrium and non-equilibrium intermetallic phases in Al-Fe and Al-Fe-Si alloys. Journal of Materials Science, 31, 24 (1996), 6645–6652
Gutierrez-Urrutia I., Munoz-Morris M.A., Morris D.G.: Contribution of microstructural parameters to strengthening in an ultrafine-grained Al-7% Si alloy processed by severe deformation. Acta Materialia, 55, 4 (2007), 1319–1330
Youan-Youan L., Da-Tong Z., Leo N.T., Wei-Wen Z.: Rapidly solidified hypereutectic Al-Si alloys prepared by powder hot extrusion. Transactions of Nonferrous Metals Society of China, 12 (2002), 878–881
