Abstract
An investigation was performed on the effects of semi-solid compression parameters, such as strain rate, compression temperature and heating time at these temperatures on deformation behaviors of two kinds of ZA27 alloys, one was modified by Zr and the other was unmodified. The results indicate that with the increasing of the strain, the stress of the modified composite first sharply increases to a peak value, then dramatically decreases to a peakeau value, and again increases till the end of deformation. But for the unmodified, after being up to a peak value, the stress only decreases slowly. As the compression temperature or the heating time decreases, or the strain rate increases, the stress level and the cracking degree of these two kinds of alloys increase. Under the same deformation conditions, the stress level and the cracking degree of the unmodified alloy are higher than those of the modified one. But there is an exception that the stress level of the unmodified alloy is minimum and smaller than that of them modified one when deformed at the low temperature of 450°C. These phenomena were mainly discussed through analyzing the microstructures under different conditions and the deformation mechanisms at different deformation stages.
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References
Prasad B K, Yegneswaran A H and Patwardhan A K. Influence of the Microconstitutes on the Tensile Properties of a Zinc-based Alloy and a Leaded-tin Bronze at Different Strain rates and temperatures.J. Mater. Sci., 1997, 32: 1169–1175
Barnhurst R J and Jacob D. Gravity Casting of Zinc-aluminum Zlloys: Development of Foundry Parameters for Casting in Sand.AFS Trans., 1998, 96: 321–328
Chen Ti-jun and Hao Yuan. Semi-solid Forming Technology of Metals and Its Application.Foundry, 2001, 50(11): 645–649
Chen C P and Tsao C-Y A. Semi-solid Deformation of Aluminum Alloy 356 with Non-dendritic Structure.Mater. Sci. Technol., 1999, 15: 981–985
Chen C P and Tsao C-Y A. Response of Spray-Deposited Stirred Cast and Conventional Cast Pb−Sn Alloys to Deformation in the Semi-solid State.J. Mater. Sci., 1995, 30: 4019–4026
Freitas E R and Ferrante M. Reological Behavior, and Deformation Characteristics of a Commercial and a Laboratory-cast Al-4%Cu Alloy in the Semi-solid State.Acta Mater., 2001, 49: 3839–3847
Tzimas E and Zavaliangos A. Mechanical Behavior, of Alloy with Equiaxed Microstructure in the Semisolid State at High Solid Content.Acta Mater., 1999, 47: 517–528
Chen C P and Tsao C-Y A. Semi-solid Deformation of Non— dendritic Structures—I. Phenomenological Behavior.Acta Mater., 1997, 45: 1955–1968
Chen Ti-jun, Hao Yuan, Ma Ying,et al. Structural Evolution of ZA27 alloy during Semi-solid Isothermal Heat Treatment.Trans. Nonferrous Met. Soc. China, 2001, 11(1): 98–102
Chen T J, Hao Y and Sun J. Microstructural and Constitutional Evolution of Cast Dendritic ZA27 Alloy during Partial Remelting. Submitted toJ. Mater. Processing Technol
Tzimas E and Zavaliangos A. Evolution of Near-Equiaxed Microstructure in the Semi-solid State.Mater Sci. Eng., 2000, A289: 228–240
Chen Ti-jun, Hao Yuan, Lu Song,et al. Influences of Strains and Isothermal Temperatures on Microstructure of ZA27 Alloy during Strain-induced Melt Activation.Trans. Met. Heat Treatment, 2000, 21(1): 26–31
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CHEN Ti-jun: Born in 1971.
Founded by the Science and Technology Committee of Gansu Province (Nos GS992-A52-024 and ZSonn-A25-048-C) and supported by Development Program for Outstanding Young Teachers in Gansu University of Technology.
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Ti-jun, C., Yuan, H. & Jun, S. Effects of compression parameters on deformation behaviors of semi-solid ZA27 alloys. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 18, 9–14 (2003). https://doi.org/10.1007/BF02838447
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DOI: https://doi.org/10.1007/BF02838447