{"title":"Crystallization of the AlMn icosahedral phase","authors":"K.F. Kelton, J.C. Holzer","doi":"10.1016/0025-5416(88)90362-X","DOIUrl":null,"url":null,"abstract":"<div><p>Differential scanning calorimetry (DSC) measurements of the crystallization kinetics of the icosahedral phase (i-phase) in Al<sub>x</sub>Mn<sub>100−x</sub> alloys for 78 ⩽ <em>x</em> ⩽ 90 are presented. Transmission electron microscopy (TEM) investigations show that for <em>x</em> > 82, the i-phase occurs as dendrites that are surrounded by α-Al. For <em>x</em><82, the decagonal phase appears in competition with the i-phase and completely replaces it by <em>x</em>=78. For one composition, Al<sub>86</sub>Mn<sub>14</sub>, the transformation kinetics and morphology were studied by electrical resistivity and DSC measurements, TEM and X-ray diffraction. The non-isothermal DSC data are fit using a numerical model. From these fits, we present crude estimates of the activation energy for the diffusion of aluminum in Al<sub>6</sub>Mn and a lower bound on the i-phase, Al<sub>6</sub>Mn interfacial energy.</p></div>","PeriodicalId":100890,"journal":{"name":"Materials Science and Engineering","volume":"99 1","pages":"Pages 389-392"},"PeriodicalIF":0.0000,"publicationDate":"1988-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0025-5416(88)90362-X","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials Science and Engineering","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/002554168890362X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 9
Abstract
Differential scanning calorimetry (DSC) measurements of the crystallization kinetics of the icosahedral phase (i-phase) in AlxMn100−x alloys for 78 ⩽ x ⩽ 90 are presented. Transmission electron microscopy (TEM) investigations show that for x > 82, the i-phase occurs as dendrites that are surrounded by α-Al. For x<82, the decagonal phase appears in competition with the i-phase and completely replaces it by x=78. For one composition, Al86Mn14, the transformation kinetics and morphology were studied by electrical resistivity and DSC measurements, TEM and X-ray diffraction. The non-isothermal DSC data are fit using a numerical model. From these fits, we present crude estimates of the activation energy for the diffusion of aluminum in Al6Mn and a lower bound on the i-phase, Al6Mn interfacial energy.
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