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Start Over Author "Nami B" Topic az91 magnesium alloy
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1. Effects of calcium and rare earth elements on microstructure and creep properties of AZ91 alloy in as cast and semisolid processed conditions.

Author

Nami, B, Shabestari, S G, Miresmaeili, S M, Razavi, H, and Mirdamadi, Sh

Subjects
*CALCIUM, *RARE earth metals, *METAL microstructure, *METAL creep, *MAGNESIUM alloys, *INTERMETALLIC compounds
Abstract

The effect of Ca and rare earth (RE) elements on the microstructure and creep properties of AZ91 magnesium alloy was studied in as cast and semisolid processed conditions. The results showed that in as cast condition of AZ91 alloy grain refinement takes place and the amount of β-Mg17Al12 intermetallic phase decreases due to addition of Ca and RE elements. Also, two new Al11RE3 and Al2Ca intermetallic compounds are formed in the Ca and RE containing alloy. In the semisolid microstructure, the size and shape factor of the primary globular α-Mg phase and the size of the α-Mg grains formed during secondary solidification decrease by adding Ca and RE elements into AZ91 alloy. It was also shown that the creep properties of AZ91 alloy is greatly improved by adding Ca and RE elements in the as cast and semisolid processed specimens. [ABSTRACT FROM AUTHOR] </p></dd> <dt class="blacklight-eds_authors col-md-3">Published</dt> <dd class="col-md-9 blacklight-eds_authors">2011</dd> <dt class="blacklight-eds_authors col-md-3"><span class="tags-custom">Full Text</span></dt> <dd class="col-md-9 blacklight-eds_authors"><a class="pdf-blue-icon" target="_blank" href="https://doi.org/10.1179/1743133610Y.0000000001">View/download PDF</a></dd> </dl> </article><article data-document-id="asx__60159991" data-document-counter="2" itemscope="itemscope" itemtype="http://schema.org/Thing" class="blacklight-academic-journal document document-position-2"> <header class="documentHeader row"> <h3 class="index_title document-title-heading col-sm-9 col-lg-10"> <span class="document-counter"> 2. </span> <a data-context-href="/articles/asx__60159991/track?counter=2&document_id=asx__60159991&search_id=46557597" href="/articles/asx__60159991">The effect of Ca and RE elements on the precipitation kinetics of Mg17Al12 phase during artificial aging of magnesium alloy AZ91</a> </h3> <div class="index-document-functions col-sm-3 col-lg-2"> <form class="bookmark-toggle" data-doc-id="asx__60159991" data-present="In Bookmarks" data-absent="Bookmark" data-inprogress="Saving..." action="/bookmarks/asx__60159991" accept-charset="UTF-8" method="post"><input type="hidden" name="_method" value="put" /><input type="hidden" name="authenticity_token" value="Chnpsv6KQjgNLedn5pDmGNEZRUufsKmCdFEy4Uey7ReH/eiCZedYHbmXJ3+kVCFAQYo9t2aIa0DqUAMFg+sEUA==" /> <input type="hidden" name="catalog_type" id="catalog_type" value="articles" /> <input type="submit" name="commit" value="Bookmark" id="bookmark_toggle_asx__60159991" class="bookmark-add btn btn-outline-secondary" data-disable-with="Bookmark" /> </form> </div> </header> <dl class="document-metadata dl-invert row"> <dt class="blacklight-eds_authors col-md-3">Author</dt> <dd class="col-md-9 blacklight-eds_authors mb-0"> <p class="truncate-text"> Amir Esgandari, B., Mehrjoo, H., Nami, B., and Miresmaeili, S.M.</p></dd> <dt class="blacklight-eds_authors col-md-3">Subjects</dt> <dd class="col-md-9 blacklight-eds_authors">*<searchLink fieldCode="DE" term="%22MAGNESIUM+compounds%22">MAGNESIUM compounds</searchLink>, *<searchLink fieldCode="DE" term="%22RARE+earth+metals%22">RARE earth metals</searchLink>, *<searchLink fieldCode="DE" term="%22PHASE+transitions%22">PHASE transitions</searchLink>, *<searchLink fieldCode="DE" term="%22METAL+creep%22">METAL creep</searchLink>, *<searchLink fieldCode="DE" term="%22NUCLEATION%22">NUCLEATION</searchLink>, *<searchLink fieldCode="DE" term="%22CRYSTAL+grain+boundaries%22">CRYSTAL grain boundaries</searchLink></dd> <dt class="blacklight-eds_languages col-md-3">Abstract</dt> <dd class="col-md-9 blacklight-eds_languages"><p class="truncate-text"> Abstract: The effect of simultaneous alloying with Ca and rare earth (RE) elements on the age hardening kinetics of AZ91 was studied through the fitting of the Johnson–Mehl–Avrami (JMA) equation. The results showed that the addition of both Ca and RE elements not only suppress discontinuous precipitation of the Mg17Al12 phase during the age hardening process, but also decrease the alloy hardness. Fitting the JMA equation to the experimental data indicated that the phase transformation during age hardening of an alloy variant containing both Ca and RE (at 170°C and 190°C) and standard AZ91 (at 170°C) takes place by the nucleation of precipitates on dislocations. In contrast, the precipitation during age hardening of AZ91 at 190°C occurs via nucleation at grain boundaries. Although it was observed that the creep strength of age hardened specimens are lower than that of the as cast specimens, but age hardening treatment has lower deleterious influence on the creep resistance of the alloy containing Ca and RE in comparison with conventional AZ91. This may be ascribed to the decreased precipitation rate resulting from the addition of both Ca and RE elements. [Copyright &y& Elsevier] </p></dd> <dt class="blacklight-eds_authors col-md-3">Published</dt> <dd class="col-md-9 blacklight-eds_authors">2011</dd> <dt class="blacklight-eds_authors col-md-3"><span class="tags-custom">Full Text</span></dt> <dd class="col-md-9 blacklight-eds_authors"><a class="pdf-blue-icon" target="_blank" href="https://doi.org/10.1016/j.msea.2011.03.022">View/download PDF</a></dd> </dl> </article> </div> </div> </div> <div class='alternate-catalog' data-alternate-catalog="/catalog?q=%22Nami+B%22"> <button type='button' class='alternate-catalog-close close' aria-label="Close"> <i class='fa fa-times-circle'></i> </button> <h3 class='alternate-catalog-title'></h3> <div class='alternate-catalog-body'> <div class='row'> <div class='col-md-6'> <h4 class="alternate-catalog-name"> Catalog </h4> <div class='alternate-catalog-desc'> Books, media, physical & digital resources </div> </div> <div class='col-md-6'> <a class="btn btn-primary" href="/catalog?q=%22Nami+B%22"> See <span class="alternate-catalog-count"%></span> catalog results </a> </div> </div> <div class='row alternate-catalog-facet-section'> <div class='col-md-12'> <ul class="alternate-catalog-facets list-inline"> </ul> </div> </div> </div> </div> <div class="modal fade" id="loginModal" tabindex="-1" role="dialog"> <button type="button" id="loginclose" class="close" data-dismiss="modal" aria-label="Close"> <span aria-hidden="true">×</span> </button> <div class="modal-dialog" role="document"> <h5>Discovery Service for Jio Institute Digital Library</h5> <br /> <p>For full access to our library's resources, please sign in.</p> </div> <div class="login-modal-button-wrapper"> <button class="login-modal-sign-in"> <a rel="nofollow" data-method="post" href="/users/auth/saml">Sign In</a> </button> </div> </div> </section> </div> </main> <footer class="navbar navbar-inverse site-footer" style="position: static;"> <div class="container footer-container"> <div class="row"> <div class="col-xs-12 col-md-3 py-4 align-self-center site-footer-links-column"> <div class="footer-logo center-block"> <a href="https://library.jioinstitute.edu.in"> <img class="logo-img" src="/assets/Jio-DLLogo-b5a8a0808ea64b7ff5d156e304a4a034eee76224caf66c04cead90a411971fad.png" /> </a> </div> </div> <div class="col-xs-12 col-md-8 py-3 pb-5 pb-md-3 site-footer-links-column align-self-center"> <div class="row text-center footer-links-row"> <div class="col-4 col-sm-2"> <div class="navlink"><a href="https://library.jioinstitute.edu.in/contact">Contact</a></div> </div> <div class="col-4 col-sm-3"> <div class="navlink"><a href="https://library.jioinstitute.edu.in/access/covid-19-advisory">Covid-19 Advisory</a></div> </div> <div class="col-4 col-sm-2"> <div class="navlink"><a href="https://library.jioinstitute.edu.in/access/policies">Policies</a></div> </div> </div> </div> </div> </div> <div class="row text-center secondary-footer"> <div class="container"> <div class="col-xs-12 col-md-2 px-0"> <div class="footer-logo"> <a href="https://jioinstitute.edu.in/"> <img class="logo-img" src="/assets/JioLogoWhite-3a250c43ad67a5117225db9885c1ac0b116f92a0df0839e850e68dfbbce66ae7.png" /> </a> </div> </div> <div class="col-md-1 col-4 py-1 py-md-3"> <div class="navlink footer-navlink"><a href="https://jioinstitute.edu.in/about">About Us</a></div> </div> <div class="col-md-1 col-4 py-1 py-md-3"> <div class="navlink footer-navlink"><a href="https://jioinstitute.edu.in/academics">Academics</a></div> </div> <div class="col-md-1 col-4 py-1 py-md-3"> <div class="navlink footer-navlink"><a href="https://jioinstitute.edu.in/research-overview">Research</a></div> </div> <div class="col-md-1 col-4 py-1 py-md-3 pl-0 pr-0"> <div class="navlink footer-navlink"><a href="https://jioinstitute.edu.in/campus-life"> Campus Life</a></div> </div> <div class="col-md-1 col-4 py-1 py-md-3"> <div class="navlink footer-navlink"><a href="https://jioinstitute.edu.in/contacts"> Contact</a></div> </div> <div class="col-md-4 col-4 py-1 py-md-3"> <div class="navlink footer-navlink float-right"><a href="https://jioinstitute.edu.in/terms-conditions">T&C</a></div> </div> <div class="col-md-1 col py-1 py-md-3 pl-0"> <div class="navlink footer-navlink float-right"><a href="https://jioinstitute.edu.in/privacy-policy"> Privacy Policy</a></div> </div> </div> </div> <!-- Global site tag (gtag.js) - Google Analytics --> <script async src=https://www.googletagmanager.com/gtag/js?id=G-R4B0KJQ5EY></script> <script> window.dataLayer = window.dataLayer || []; function gtag(){dataLayer.push(arguments);} gtag('js', new Date()); gtag('config', 'G-R4B0KJQ5EY'); </script> </footer> <div id="blacklight-modal" class="modal fade" tabindex="-1" role="dialog" aria-hidden="true"> <div class="modal-dialog modal-lg" role="document"> <div class="modal-content"> </div> </div> </div> </body> </html>