Effect of high shear rate on solidification microstructure of semisolid AZ91D alloy

To investigate the effects of rotation speed and shearing time on morphology of semisolid AZ91D alloy, experimental work was undertaken using a twin-screw slurry maker. The results show that increasing the rotation speed and reasonable time can give rise to substantial grain refinement during contin...

Full description

Saved in:
Bibliographic Details
Published inTransactions of Nonferrous Metals Society of China Vol. 20; pp. s868 - s872
Main Authors ZHU, Guang-lei, XU, Jun, ZHANG, Zhi-feng, LIU, Guo-jun, Fan, Z.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.09.2010
Subjects
AZ91D
China
high shear rate
Magnesium base alloys
Microstructure
Morphology
Nucleation
rotation speed
semisolid
Semisolids
Shear rate
Shearing
solidification
Turbulent flow
rotation speed
semisolid
solidification
AZ91D
high shear rate
Online AccessGet full text

Cover

More Information
Summary:To investigate the effects of rotation speed and shearing time on morphology of semisolid AZ91D alloy, experimental work was undertaken using a twin-screw slurry maker. The results show that increasing the rotation speed and reasonable time can give rise to substantial grain refinement during continuous shearing stage, which can be attributed to the increasing of effective nucleation rate caused by the extremely uniform temperature due to high shear rate and high degree of turbulence. Comparing with low rotation speed at the same thermal condition, the analysis indicates that the microstructures obtained at high rotation speed are homogenous spherical and fine grains instead of dendritic or rosette and exhibits uniform distribution in the eutectic matrix.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:1003-6326
DOI:10.1016/S1003-6326(10)60597-3