Microstructural evolution and phase transformations of mechanically stirred non-dendritic ZA27 alloy during partial remelting

2004 ◽  
Vol 19 (4) ◽  
pp. 56-61 ◽  
Author(s):  
Chen Ti-jun ◽  
Hao Yuan ◽  
Sun Jun
Keyword(s):  
Phase Transformations ◽  
Microstructural Evolution ◽  
Za27 Alloy ◽  
Partial Remelting

Static electropulsing-induced phase transformations of a cold-deformed ZA27 alloy

2011 ◽  
Vol 26 (14) ◽  
pp. 1696-1701 ◽  
Author(s):  
Yaohua Zhu ◽  
Suet To ◽  
Xianming Liu ◽  
Guoliang Hu ◽  
Qing Xu
Keyword(s):  
Phase Transformations ◽  
Za27 Alloy ◽  
Image Position

Abstract

Formation and Evolution of Liquid Pools Entrapped within Primary Particles of In Situ Mg2Si/AM60B Composite with Fine-Grains during Partial Remelting

2013 ◽  
Vol 446-447 ◽  
pp. 55-61
Author(s):  
Su Qing Zhang ◽  
Ti Jun Chen ◽  
Ying Ma ◽  
Yuan Dong Li ◽  
Yuan Hao
Keyword(s):  
Phase Transformations ◽  
Formation Mechanism ◽  
Partial Remelting ◽  
Initial Stage ◽  
Primary Particles ◽  
Formation And Evolution ◽  
Liquid Pools ◽  
Two Stages

The formation mechanism and evolution of liquid pools entrapped within solid grains have been investigated during partial remelting of in-situ Mg2Si/AM60B composite with fine-grains during partial remelting. The results indicate that the merging of dendrite arms during the initial stage of partial remelting is the main cause for the formation of the entrapped liquid pools. In view of phase transformations, the formation of the entrapped liquid pools is attributed to the reactions of α+β→L and α→L, essentially. The evolution of the liquid pools during latter heating can be divided into two stages: the agglomeration of each others and connection with intergranular liquid.

Phase Transformations and Microstructural Evolution of Mo-Bearing Stainless Steels

2007 ◽  
Vol 38 (4) ◽  
pp. 671-685 ◽  
Author(s):  
T.D. Anderson ◽  
J.N. Dupont ◽  
M.J. Perricone ◽  
A.R. Marder
Keyword(s):  
Phase Transformations ◽  
Microstructural Evolution ◽  
Stainless Steels

Microstructural Evolution of AZ31 Mg Wrought Alloy during Partial Remelting for Thixoextrusion

2006 ◽  
Vol 116-117 ◽  
pp. 251-254
Author(s):  
Young Ok Yoon ◽  
Shae K. Kim
Keyword(s):  
Grain Size ◽  
Microstructural Evolution ◽  
Liquid Fraction ◽  
Isothermal Holding ◽  
Holding Time ◽  
Interesting Point ◽  
Grain Sizes ◽  
Partial Remelting ◽  
Average Grain Size ◽  
Holding Temperature

An attempt has been made to investigate feasibility of thixoextrusion for AZ31 Mg wrought alloy through simple partial remelting. Microstructural evolution of AZ31 Mg wrought alloy for thixoextrusion was investigated as functions of isothermal holding temperature and time in the partially remelted semisolid state. The interesting point of this study was that the thixotropic structures of AZ31 Mg wrought alloy without additional pretreatment could be obtained through simple partial remelting. The uniform average grain size and liquid fraction according to the isothermal holding time were very important for the thixoextrusion. Because, it is must be considered on actual extrusion time. The liquid fraction was increased with increasing isothermal holding temperature and time. But, the liquid fraction was almost uniform after 10 min. The average grain size was decreased with increasing isothermal holding temperature. On the other hand, as the holding time increased, the average grain sizes were uniform at 615 and 622. This phenomenon is very useful for thixoextrusion in terms of process control such as actual extrusion time.

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