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Effects of compressing and remelting in SIMA processing on semi-solid structure evolution of an al-zn wrought alloy

Rare Metals 2003年第3期22卷 185-191页

作者： LIUChangming ZOUMaohua CollegeofMechanicalEngineedng ChongqingUniversityChongqing400044China CollegeofPolytechnic ChongqingUniversityChongqing400044China

Structure evolution of an al-zn wrought alloy in remelting processing in thestrain induced melt activated (SIMA) serai-solid procedure was observed, and effects of factors, theremelting temperature, the holding time, and the compression strain, on structures and grain sizesof the alloy were investigated. The results show that (1) the proper temperature of remelting is inthe range of 610 to 615℃; (2) the grain size in specimen with greater compression strain is smallerthan that with smaller compression strain in condition of the same remelting temperature andholding time, and the grain size in local area with great local equivalent strain is smaller thanthat with small one; (3) liquid occurs in form of cluster in matrix during remelting and itsquantity increases with remelting time increasing; liquid in specimen with great compression strainoccurs earlier than that with small one, and quantity of liquid in the center of specimen withgreater local equivalent strain is greater than that in the two ends of it; (4) distortion energyafter deforming in matrix of the alloy is the significant factor to activate melting of matrix atlocal area with great local equivalent strain.

关键词： semi-solid structure evolution strain induced melt activated processing semi-solid remelting al-zn alloy

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CELLULAR SPACING SELECTION OF al-0.53wt%zn alloy UNDER NEAR-RAPID DIRECTIONal SOLIDIFICATION CONDITION

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Acta Metallurgica Sinica(English Letters) 1998年第5期11卷 320-324页

作者： J.Feng W.D.Huang X.Lin T.Li Y.F.Xue Y.H.Zhou Northwestern Polytechnical Univ Xi'an China

In order to investigate the response of cellular spacing to the variation of growth velocity under near-rapid directional solidification condition, al-0.53wt%zn alloy is directionally solidified with Bridgman apparatus. The results show that at the given temperature gradient the obtained microstrvctures are all cells and there exists a wide distribution range of cellular spacing. The maximum, λmax, minimum, λmin, and average cellular spacing, λ, as functions of growth rate, V, can be given by λmax=948.51V-0.4961, λmin= 661.16V-0.5015 and λ=412.41V-0.5049, respectively. The experimental results are compared with that predicted by KGT model, and a good agreement is found. Moreover,it is found that the average cellular spacing is also remarkably history-dependent.

关键词： al-zn alloy near-rapid directional solidification cellular spacing history-dependence

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