TY - THES

T1 - Neue Aluminiumlegierungen für superplastische Umformoperationen

AU - Pölzl, Johannes

N1 - embargoed until 27-11-2024

PY - 2019

Y1 - 2019

N2 - Due to the required reduction of CO2 emissions and the saving of energy to address climate change and other negative environmental aspect, the need for lightweight material construction is increasing. For the purposes of lightweight construction using aluminum alloys is suitable both in aircraft and in vehicle construction. However, due to the increasing shape complexity, the material must have good formability and high durability due to crash performance and hail damage resistance. Because of the currently unfavorable trade-off between strength and formability in aluminum materials, they can’t always replace steel in mass applications. The conflict of high strength and high ductility is being explored in the Christian Doppler Laboratory for advanced aluminum alloys. This work is part of the approach of "cross-over alloys". They combine the advantages of different classes of aluminum wrought alloys, which have either good formability or high strength. The key is now to understand the mechanisms for high formability and strength and thus to generate strategies for the combination of different classes. For this reason, this master thesis deals with the modification of a 5xxx aluminum alloy in order to enable hardenability as well as superplastic forming capability. Effective results are expected by the addition and variation of different alloying elements in combination with applied heat treatment strategies. The preparation of the samples is done in two scales, which are evaluated qualitatively and quantitatively.

AB - Due to the required reduction of CO2 emissions and the saving of energy to address climate change and other negative environmental aspect, the need for lightweight material construction is increasing. For the purposes of lightweight construction using aluminum alloys is suitable both in aircraft and in vehicle construction. However, due to the increasing shape complexity, the material must have good formability and high durability due to crash performance and hail damage resistance. Because of the currently unfavorable trade-off between strength and formability in aluminum materials, they can’t always replace steel in mass applications. The conflict of high strength and high ductility is being explored in the Christian Doppler Laboratory for advanced aluminum alloys. This work is part of the approach of "cross-over alloys". They combine the advantages of different classes of aluminum wrought alloys, which have either good formability or high strength. The key is now to understand the mechanisms for high formability and strength and thus to generate strategies for the combination of different classes. For this reason, this master thesis deals with the modification of a 5xxx aluminum alloy in order to enable hardenability as well as superplastic forming capability. Effective results are expected by the addition and variation of different alloying elements in combination with applied heat treatment strategies. The preparation of the samples is done in two scales, which are evaluated qualitatively and quantitatively.

KW - aluminum

KW - 5083

KW - copper

KW - zinc

KW - silver

KW - solution annealing

KW - quenching

KW - superplasticity

KW - hardening

KW - hardness

KW - tensile strength

KW - microstructure

KW - Aluminium

KW - 5083

KW - Kupfer

KW - Zink

KW - Silber

KW - Lösungsglühen

KW - Abschrecken

KW - Superplastizität

KW - Aushärtung

KW - Härte

KW - Zugfestigkeit

KW - Mikrostruktur

M3 - Master's Thesis

ER -