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Design of a New Casting Alloys containing Li or Ti+Zr and Optimizatin of its Heat Treatment

Identifikátory výsledku

  • Kód výsledku v IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F14%3A00223868" target="_blank" >RIV/68407700:21220/14:00223868 - isvavai.cz</a>

  • Výsledek na webu

  • DOI - Digital Object Identifier

Alternativní jazyky

  • Jazyk výsledku

    angličtina

  • Název v původním jazyce

    Design of a New Casting Alloys containing Li or Ti+Zr and Optimizatin of its Heat Treatment

  • Popis výsledku v původním jazyce

    In this paper was proposed to design new casting alloys on the base of the Al-Mg-Si system using Li addition to achieve precipitation strengthening effect and alloying by Ti+Zr to achieve saturation of solid solution and grain refinement effect. The as-cast and heat treated structure of permanent mould casting of AlMg5Si2Mn containing 1.0 wt.% Li and 0.1 wt.% Ti+0.1 wt.% Zr alloys was investigated by differential scanning calorimetry, microhardness measurements, scanning and transmission electron microscopy and energy dispersive X-ray analysis. Mechanical properties of these alloys were investigated with modern automated ball indentation method. This method showed good convergence with standard tensile tests and allows to determine hardness, yield stress and elastic modulus of tested alloys. It was observed that addition of Li causes modification of (Al)+(Mg2Si) eutectic lamellas making them thinner and interlamella distance becomes larger. Ti+Zr addition does not change eutectic morphology but strongly reduces the size of α-Al dendrites, also, it produces the nucleation particles for primary Mg2Si crystals. Homogenization of studied alloys at 570 C results in disintegration of Mg2Si lamellas and this process takes 30 min to transform plate like lamellas to fine spheres. It was established that hardness and microhardness both of Li and Ti+Zr containing alloys decrease at the same time. Further heating does not produce remarkable changes of hardness. Artificial aging leads to the increasing of hardness and microhardness. Obtained results showed that heat treatment of AlMg5Si2Mn improves its mechanical properties with Li and Ti+Zr assist precipitation hardening and solid solution strengthening effects.

  • Název v anglickém jazyce

    Design of a New Casting Alloys containing Li or Ti+Zr and Optimizatin of its Heat Treatment

  • Popis výsledku anglicky

    In this paper was proposed to design new casting alloys on the base of the Al-Mg-Si system using Li addition to achieve precipitation strengthening effect and alloying by Ti+Zr to achieve saturation of solid solution and grain refinement effect. The as-cast and heat treated structure of permanent mould casting of AlMg5Si2Mn containing 1.0 wt.% Li and 0.1 wt.% Ti+0.1 wt.% Zr alloys was investigated by differential scanning calorimetry, microhardness measurements, scanning and transmission electron microscopy and energy dispersive X-ray analysis. Mechanical properties of these alloys were investigated with modern automated ball indentation method. This method showed good convergence with standard tensile tests and allows to determine hardness, yield stress and elastic modulus of tested alloys. It was observed that addition of Li causes modification of (Al)+(Mg2Si) eutectic lamellas making them thinner and interlamella distance becomes larger. Ti+Zr addition does not change eutectic morphology but strongly reduces the size of α-Al dendrites, also, it produces the nucleation particles for primary Mg2Si crystals. Homogenization of studied alloys at 570 C results in disintegration of Mg2Si lamellas and this process takes 30 min to transform plate like lamellas to fine spheres. It was established that hardness and microhardness both of Li and Ti+Zr containing alloys decrease at the same time. Further heating does not produce remarkable changes of hardness. Artificial aging leads to the increasing of hardness and microhardness. Obtained results showed that heat treatment of AlMg5Si2Mn improves its mechanical properties with Li and Ti+Zr assist precipitation hardening and solid solution strengthening effects.

Klasifikace

  • Druh

    D - Stať ve sborníku

  • CEP obor

    JG - Hutnictví, kovové materiály

  • OECD FORD obor

Návaznosti výsledku

  • Projekt

    <a href="/cs/project/LO1207" target="_blank" >LO1207: Podpora udržitelnosti Inovačního centra diagnostiky a aplikace materiálů na ČVUT-FS v Praze</a><br>

  • Návaznosti

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Ostatní

  • Rok uplatnění

    2014

  • Kód důvěrnosti údajů

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Údaje specifické pro druh výsledku

  • Název statě ve sborníku

    METAL 2014: 23RD INTERNATIONAL CONFERENCE ON METALLURGY AND MATERIALS

  • ISBN

    978-80-87294-54-3

  • ISSN

  • e-ISSN

  • Počet stran výsledku

    6

  • Strana od-do

    1399-1404

  • Název nakladatele

    TANGER

  • Místo vydání

    Ostrava

  • Místo konání akce

    Brno

  • Datum konání akce

    21. 5. 2014

  • Typ akce podle státní příslušnosti

    EUR - Evropská akce

  • Kód UT WoS článku

    000350641700232