<?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>0120-5609</journal-id>
<journal-title><![CDATA[Ingeniería e Investigación]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. Investig.]]></abbrev-journal-title>
<issn>0120-5609</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad Nacional de Colombia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56092023000100010</article-id>
<article-id pub-id-type="doi">10.15446/ing.investig.93635</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Inverse Hall-Petch Behavior for Nanocrystalline Aluminum Using Molecular Dynamics]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudio del comportamiento inverso de Hall-Petch en aluminio nanocristalino usando dinámica molecular]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barboza]]></surname>
<given-names><![CDATA[Alexandre M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aliaga]]></surname>
<given-names><![CDATA[Luis C. R.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bastos]]></surname>
<given-names><![CDATA[Ivan N.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UERJ  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UERJ  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,UERJ  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2023</year>
</pub-date>
<volume>43</volume>
<numero>1</numero>
<fpage>1</fpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56092023000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56092023000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56092023000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This work investigates the mechanical behavior of nanocrystalline aluminum, with special focus on deformation mechanisms, using molecular dynamics simulations with an interatomic potential parameterized by the authors. To this end, four nanocrystalline samples with grain sizes ranging from 8,2 to 14,2 nm were constructed, each with a volume of 15 x 15 x 20 nm3. As expected, the data from the tensile tests at a strain rate of 1,0 x 109 s-1 showed an inverse Hall-Petch relationship. The work hardening behavior revealed no significant gain in mechanical strength. The dislocation analysis indicated that perfect dislocation density decreases during tensile testing, while the Shockley partials increase. Grain boundary-mediated plasticity was evidenced with atomic diffusion along grain boundaries, as well as by grain rotation. Thus, it is concluded that the conventional plastic deformation mechanisms of metals are not preponderant for nanocrystalline aluminum.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[ABSTRACT En este trabajo se evalúa el comportamiento mecánico del aluminio nanocristalino, con especial atención a los mecanismos de deformación, utilizando simulaciones de dinamica molecular mediante un potencial interatomico parametrizado por los autores. Para este fin, se construyeron cuatro muestras nanocristalinas con tamaños de grano que oscilaban entre 8,2 y 14,2 nm, cada una con un volumen de 15 x 15 x 20 nm3. Como se esperaba, los datos de los ensayos de tracción con tasa de deformación de 1,0 x 109 s-1 mostraron una clara relación inversa de Hall-Petch. El comportamiento de endurecimiento por trabajo mecánico no revelo una ganancia significativa de resistencia mecánica. El analisis de las dislocaciones indico que las dislocaciones perfectas disminuyen durante los ensayos de traccion, mientras que los parciales de Shockley aumentan. Se evidencio la plasticidad del material con la difusión atomica a lo largo de los limites de grano, así como por la rotación de los granos. De este modo, se concluye que los mecanismos convencionales de deformación plastica de los metales convencionales no son preponderantes para el aluminio nanocristalino.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[molecular dynamics]]></kwd>
<kwd lng="en"><![CDATA[Hall-Petch]]></kwd>
<kwd lng="en"><![CDATA[mechanical behavior]]></kwd>
<kwd lng="en"><![CDATA[nanocrystalline aluminum]]></kwd>
<kwd lng="es"><![CDATA[dinamica molecular]]></kwd>
<kwd lng="es"><![CDATA[Hall-Petch]]></kwd>
<kwd lng="es"><![CDATA[comportamiento mecanico]]></kwd>
<kwd lng="es"><![CDATA[aluminio nanocristalino]]></kwd>
</kwd-group>
</article-meta>
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