The rheological behavior and microstructure of semi-solid AZ91D was studied using a Couette type viscometer. The results show that the apparent viscosity of semi-solid AZ91D increases with the cooling rate increasing when it is continuously cooled and mechanically stirred and the empiric relation of the apparent viscosity with the cooling rate and solid fraction at shearing rate 93.7 s-1 is expressed as η=[0.66 - 0.63e(-ε/3.01)]e(fs/0.14), and with the shearing rate and solid fraction at cooling rate 4℃/min is shown as η=0.55e(fs/0.11-γ/87.59), as well as the cooling rate and shearing rate have an important effect on the microstructure of the semi-solid AZ91D alloy slurry, and decreasing the cooling rate and increasing the shearing rate are favorable to the nondendritic evolution of the primary grains.
参考文献
| [1] | NLradley;RDWVeil;WJAchafer;ANNiemi .[P].US 5040589,1989. |
| [2] | PSFrederick;NLBradley;SCErickson .[J].Current Advances in Materials and Processes,1988,134(04):53. |
| [3] | RFDecker;RDCarnahan;RVining;EEldener.[A].University of Sheffield Engl June 19-21 1996 UK: Department of Engineering Materials University of Sheffield,1996:221. |
| [4] | TLeng.[A].Italy,Sept 27th-29th,2000,Materials Science,Chemical Engineering Department,Politecnico DI Torino:215. |
| [5] | HsPeng;WMHsu .[Q].ibid,2000. |
| [6] | SJi;ZFan;GLiu;XFang SHSong.[A].Tsukuba JapanSept 25th-27th 2002 National Institute of Advanced Industrial Science Technology Japan Society for Technology of Plasticity:683. |
| [7] | DSpencer;MCFlemings .[J].Metallurgical and Materials Transactions,1972,3:1925. |
| [8] | PAJoly;RMehrabian.[J].Journal of Materials Science,1976(11):1393. |
| [9] | MCFlemings.Solidification Processing McGraw-Hill Book Company[M].The United States of American,1974:34. |
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