<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1665-6423</journal-id>
<journal-title><![CDATA[Journal of applied research and technology]]></journal-title>
<abbrev-journal-title><![CDATA[J. appl. res. technol]]></abbrev-journal-title>
<issn>1665-6423</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias Aplicadas y Tecnología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1665-64232009000200004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The effect of Mg content on microstructure in Al-12wt. %Zn-x Mg Alloy]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez]]></surname>
<given-names><![CDATA[M. A.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campillo]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Diaz]]></surname>
<given-names><![CDATA[R. A.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarez-Fregoso]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez-Islas]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México (UNAM) Facultad de Química ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México (UNAM) Instituto de Investigaciones en Materiales ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad Nacional Autónoma de México (UNAM) Instituto de Ciencias Físicas ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<volume>7</volume>
<numero>2</numero>
<fpage>153</fpage>
<lpage>162</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1665-64232009000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1665-64232009000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1665-64232009000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The effect of adding different Mg contents to an Al-12wt.%Zn master alloy was experimentally investigated. The Al-Zn-Mg alloys were unidirectionally solidified as a function of solidification parameters, temperature gradient G L, solidification front velocity V, and composition C0. The alloys were solidified with a constant temperature gradient (G L=2500K/m) in the solidification front velocity range from 4X10-6m/s to 1.7X10-4m/s. The resulting microstructure was characterized to investigate the effect of solidification front velocities and composition on primary dendrite arm spacing, volume percentage of eutectic in interdendritic regions and &#964; intermetallic phase in &#945;-Al matrix. Theoretical models for the dendrite arm spacing and dendrite tip radius have been compared with the experimental observations.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El efecto de la adición de diferentes contenidos de Mg a una aleación maestra Al-Zn-Mg fue investigado experimentalmente. Las aleaciones Al-Zn-Mg fueron solidificadas unidireccionalmente como una función de los parámetros de solidificación; gradiente de temperatura G L, velocidad del frente de solidificación V, y la composición química C0. La aleación fue solidificada con un gradiente de temperatura constante (G L=2500K/m) en el rango de velocidades del frente de solidificación desde 4X10-6m/s hasta 1.7X10-4m/s. La microestructura resultante fue caracterizada para investigar el efecto de la velocidad del frente de solidificación y la composición química sobre el espaciamiento dendritico primario, el porcentaje del volumen de eutectico en las regiones interdendriticas y la fase intermetalica &#964;, en la matriz &#945;-Al. Los modelos teóricos para el espaciamiento dendritico primario y el radio de la punta de la dendrita han sido comparados con las observaciones experimentales.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[aluminum alloys]]></kwd>
<kwd lng="en"><![CDATA[dendrite arm spacing]]></kwd>
<kwd lng="en"><![CDATA[solidification]]></kwd>
<kwd lng="en"><![CDATA[predictions]]></kwd>
<kwd lng="en"><![CDATA[microstructure]]></kwd>
<kwd lng="es"><![CDATA[aleaciones de aluminio]]></kwd>
<kwd lng="es"><![CDATA[espaciamiento dendritico]]></kwd>
<kwd lng="es"><![CDATA[solidificación]]></kwd>
<kwd lng="es"><![CDATA[predicciones]]></kwd>
<kwd lng="es"><![CDATA[microestructura]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="center"><font face="verdana" size="4"><b>The effect of Mg content on microstructure in Al&#150;12wt. %Zn&#150;x Mg Alloy</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>M. A. Su&aacute;rez*<sup>1</sup>, B. Campillo<sup>1&#150;3</sup>, R. A. Rodr&iacute;guez&#150;Diaz<sup>1</sup>, O. Alvarez&#150;Fregoso<sup>2</sup>, J. A. Ju&aacute;rez&#150;Islas<sup>2</sup></b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>1</sup> Facultad de Qu&iacute;mica, Universidad Nacional Aut&oacute;noma de M&eacute;xico (UNAM), Circuito Exterior S/N, Cd. Universitaria, CP. 04510. M&eacute;xico D.F. *</i><a href="mailto:msuarez@iim.unam.mx">msuarez@iim.unam.mx</a></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Instituto de Investigaciones en Materiales, (UNAM), Circuito Exterior S/N, Cd. Universitaria, C.P. 04510, M&eacute;xico, D.F.</i></font></p>  	    <p align="justify"><font face="verdana" size="2"><i><sup>3</sup> Instituto de Ciencias F&iacute;sicas, Universidad Nacional Aut&oacute;noma de M&eacute;xico (UNAM), Av. Universidad s/n Col. Chamilpa, Cuernavaca, CP 62210, Morelos, M&eacute;xico.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">The effect of adding different Mg contents to an Al&#150;12wt.%Zn master alloy was experimentally investigated. The Al&#150;Zn&#150;Mg alloys were unidirectionally solidified as a function of solidification parameters, temperature gradient G<sub>L</sub>, solidification front velocity V, and composition C<sub>0</sub>. The alloys were solidified with a constant temperature gradient (G<sub>L</sub>=2500K/m) in the solidification front velocity range from 4X10<sup>&#150;6</sup>m/s to 1.7X10<sup>&#150;4</sup>m/s. The resulting microstructure was characterized to investigate the effect of solidification front velocities and composition on primary dendrite arm spacing, volume percentage of eutectic in interdendritic regions and &#964; intermetallic phase in &#945;&#150;Al matrix. Theoretical models for the dendrite arm spacing and dendrite tip radius have been compared with the experimental observations.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> aluminum alloys, dendrite arm spacing, solidification, predictions, microstructure.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>  	    <p align="justify"><font face="verdana" size="2">El efecto de la adici&oacute;n de diferentes contenidos de Mg a una aleaci&oacute;n maestra Al&#150;Zn&#150;Mg fue investigado experimentalmente. Las aleaciones Al&#150;Zn&#150;Mg fueron solidificadas unidireccionalmente como una funci&oacute;n de los par&aacute;metros de solidificaci&oacute;n; gradiente de temperatura G<sub>L</sub>, velocidad del frente de solidificaci&oacute;n V, y la composici&oacute;n qu&iacute;mica C<sub>0</sub>. La aleaci&oacute;n fue solidificada con un gradiente de temperatura constante (G<sub>L</sub>=2500K/m) en el rango de velocidades del frente de solidificaci&oacute;n desde 4X10<sup>&#150;</sup><sup>6</sup>m/s hasta 1.7X10<sup>&#150;4</sup>m/s.</font></p>  	    <p align="justify"><font face="verdana" size="2">La microestructura resultante fue caracterizada para investigar el efecto de la velocidad del frente de solidificaci&oacute;n y la composici&oacute;n qu&iacute;mica sobre el espaciamiento dendritico primario, el porcentaje del volumen de eutectico en las regiones interdendriticas y la fase intermetalica &#964;, en la matriz &#945;&#150;Al. Los modelos te&oacute;ricos para el espaciamiento dendritico primario y el radio de la punta de la dendrita han sido comparados con las observaciones experimentales.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> aleaciones de aluminio, espaciamiento dendritico, solidificaci&oacute;n, predicciones, microestructura.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/jart/v7n2/v7n2a4.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    ]]></body>
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