To obtain a fine-grained Mg matrix, the (submicron + micron) bimodal size SiC particle reinforced AZ91 (SiCp/AZ91) composite was subjected to forging followed by the extrusion process first. Then, the fine-grained bimodal size SiCp/AZ91 composite was compressed at 270–370 °C with 0.1–0.001 s−1. The result indicated that the refinement of the Mg matrix contributed to its deteriorated strength at high temperature. However, the grain size is not the only factor influencing flow stress but the SiCp also plays an important role. The effect of SiCp on the fine grained Mg matrix depends on grain size and dislocation density, both of which strongly depend on temperature and strain rate. As compared with the fine grained Mg matrix reinforced by single size SiCp, the one with bimodal size SiCp unusually exhibit lower flow stress during hot compression. The calculated activation energy of the bimodal size SiCp/AZ91 composite is higher than the micron SiCp/AZ91 composite; however, nearly the same as the submicron SiCp/AZ91 composite, and the deformation of which was thought to be controlled by ∼1 vol% submicron SiCp.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
Subscribe to journal
Immediate online access to all issues from 2019. Subscription will auto renew annually.
Tax calculation will be finalised during checkout.
X.J. Wang, D.K. Xu, R.Z. Wu, X.B. Chen, Q.M. Peng, L. Jin, Y.C. Xin, Z.Q. Zhang, Y. Liu, X.H. Cheng, G. Chen, K.K. Deng, and H.Y. Wang: What is going on in magnesium alloys?J. Mater. Sci. Technol. 34, 245 (2018).
X.J. Wang, X.S. Hu, W.Q. Liu, J.F. Du, K. Wu, Y.D. Huang, and M.Y. Zheng: Ageing behavior of as-cast SiCp/AZ91 Mg matrix composites. Mater. Sci. Eng., A 682, 194 (2017).
M.J. Shen, X.J. Wang, M.F. Zhang, M.Y. Zheng, and K. Wu: Significantly improved strength and ductility in bimodal-size grained microstructural magnesium matrix composites reinforced by bimodal sized SiCp over traditional magnesium matrix composites. Compos. Sci. Technol. 118, 85 (2015).
L.Q. Chen and Y.T. Yan: Microstructures and mechanical properties of magnesium matrix composites: A review. Acta Metall. Sin. (Engl. Lett.) 27, 762 (2014).
K.K. Deng, X.J. Wang, Y.W. Wu, X.S. Hu, K. Wu, and W.M. Gan: Effect of particle size on microstructure and mechanical properties of SiCp/AZ91 magnesium matrix composite. Mater. Sci. Eng., A 543, 158 (2012).
M.J. Shen, X.J. Wang, T. Ying, K. Wu, and W.J. Song: Characteristics and mechanical properties of magnesium matrix composites reinforced with micron/submicron/nano SiC particles. J. Alloys Compd. 686, 831 (2016).
K.K. Deng, J.Y. Shi, C.J. Wang, X.J. Wang, Y.W. Wu, K.B. Nie, and K. Wu: Microstructure and strengthening mechanism of bimodal size particle reinforced magnesium matrix composite. Composites, Part A 43, 1280 (2012).
L.J. Zhang, F. Qiu, J.G. Wang, H.Y. Wang, and Q.C. Jiang: Microstructures and mechanical properties of the Al2014 composites reinforced with bimodal sized SiC particles. Mater. Sci. Eng., A 637, 70 (2015).
S.S. Zhou, K.K. Deng, J.C. Li, K.B. Nie, F.J. Xu, H.F. Zhou, and J.F. Fan: Hot deformation behavior and workability characteristics of bimodal size SiCp/AZ91 magnesium matrix composite with processing map. Mater. Des. 64, 177 (2014).
K.K. Deng, J.C. Li, K.B. Nie, F.J. Xu, and D.D. Wang: Hot deformation behaviour of as-extruded micrometre SiCp reinforced AZ91 composite. Mater. Res. Innovations 19 (Suppl. 4), 117 (2015).
K.K. Deng, J.C. Li, F.J. Xu, K.B. Nie, and W. Liang: Hot deformation behavior and processing maps of fine-grained SiCp/AZ91 composite. Mater. Des. 67, 72 (2015).
K.K. Deng, X.J. Wang, M.Y. Zheng, and K. Wu: Dynamic recrystallization behavior during hot deformation and mechanical properties of 0.2 µm SiCp reinforced Mg matrix composite. Mater. Sci. Eng., A 560, 824 (2013).
C.J. Wang, K.K. Deng, and W. Liang: High temperature damping behavior controlled by submicron SiCp in bimodal size particle reinforced magnesium matrix composite. Mater. Sci. Eng., A 668, 55 (2016).
S.S. Zhou, K.K. Deng, J.C. Li, S.J. Shang, W. Liang, and J.F. Fan: Effects of volume ratio on the microstructure and mechanical properties of particle reinforced magnesium matrix composite. Mater. Des. 63, 672 (2014).
M.R. Barnett, A.G. Beer, D. Atwell, and A. Oudin: Influence of grain size on hot working stresses and microstructures in Mg–3Al–1Zn. Scripta Mater. 51, 18 (2004).
T. Sakai and J.J. Jonas: Dynamic recrystallization: Mechanical and microstructural considerations. Acta Metall. 32, 189 (1984).
T. Sakai, A. Belyakov, R. Kaibyshev, H. Miura, and J.J. Jonas: Dynamic and post-dynamic recrystallization under hot, cold and sever plastic deformation conditions. Prog. Mater. Sci. 60, 130 (2014).
K.K. Deng, J.C. Li, K.B. Nie, X.J. Wang, and J.F. Fan: High temperature damping behavior of as-deformed Mg matrix influenced by micron and submicron SiCp. Mater. Sci. Eng., A 624, 62 (2015).
J.C. Li, K.B. Nie, K.K. Deng, S.J. Shang, S.S. Zhou, F.J. Xu, and J.F. Fan: Microstructure stability of as-extruded bimodal size SiCp/AZ91 composite. Mater. Sci. Eng., A 615, 489 (2014).
F.J. Humphreys and P.N. Kalu: Dislocation-particle interactions during high temperature deformation of two-phase aluminium alloys. Acta Metall. 35, 2815 (1987).
I. Sabirov, M.R. Barnett, Y. Estrin, and P.D. Hodgson: The effect of strain rate on the deformation mechanisms and the strain rate sensitivity of an ultra-fine-grained Al alloy. Scripta Mater. 61, 181 (2009).
S.C. Tjong and Z.Y. Ma: High-temperature creep behaviour of powder-metallurgy aluminium composites reinforced with SiC particles of various sizes. Compos. Sci. Technol. 59, 1117 (1999).
T.G. Nieh, J. Wadsworth, and O.D. Sherby: Superplasticity in Metals and Ceramics (Cambridge University Press, New York, 1997).
S.S. Vagarali and T.G. Langdon: Deformation mechanisms in h.c.p. metals at elevated temperatures—II. Creep behavior of a Mg–0.8% Al solid solution alloy. Acta Mater. 30, 1157 (1982).
H.J. Frost and M.E. Ashby: Deformation Mechanism Maps (Pergamon Press, Oxford, 1982).
This work was supported by “National Natural Science Foundation of China” (Grant No. 51771128), Projects of International Cooperation in Shanxi (Grant No. 201703D421039), and the “Natural Science Foundation of Shanxi” (Grant No. 201601D011034).
About this article
Cite this article
Wang, Cj., Deng, Kk., Li, Jc. et al. Flow stress and deformation behavior of fine-grained Mg matrix influenced by bimodal size SiCp. Journal of Materials Research 33, 1723–1732 (2018). https://doi.org/10.1557/jmr.2018.135