Design of a New Casting Alloys containing Li or Ti+Zr and Optimizatin of its Heat Treatment
The result's identifiers
Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Design of a New Casting Alloys containing Li or Ti+Zr and Optimizatin of its Heat Treatment
Original language description
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.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
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Result continuities
Project
<a href="/en/project/LO1207" target="_blank" >LO1207: Support of Sustainability of the Innovation Centre of Diagnostics and Applications of Materials at CTU-FME in Prague</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
METAL 2014: 23RD INTERNATIONAL CONFERENCE ON METALLURGY AND MATERIALS
ISBN
978-80-87294-54-3
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
1399-1404
Publisher name
TANGER
Place of publication
Ostrava
Event location
Brno
Event date
May 21, 2014
Type of event by nationality
EUR - Evropská akce
UT code for WoS article
000350641700232