Zaznavanje mikrostrukturnih sprememb med toplotno obdelavo Al zlitine 2011 z merjenjem električne upornosti : diplomsko delo

Kropec, Melanja (author), Bizjak, Milan (mentor), Vončina, Maja (comentor)

Aluminij zaradi svojih idealnih lastnosti imenujemo kovina moderne dobe. Za aluminijeve gnetne zlitine skupine 2xxx je značilna slabša odpornost proti koroziji in dobre trdnostne lastnosti. Baker, kot glavni legirni element, zagotavlja trdnost na širokem temperaturnem območju. Je zelo primerna za uporabo na avtomatskih stružnicah, kjer lahko izdelujemo kompleksne dele. Električna prevodnost je lastnost materiala, ki opiše njegovo zmožnost gibanja električno nabitih delcev. Nanjo vpliva temperatura, kristalna struktura oz. število prostih elektronov, mobilnost in s tem povprečna hitrost elektrona. Uporu, na katerega elektroni naletijo med gibanjem pa pravimo električna upornost. V diplomski nalogi zaznavamo mikrostrukturne spremembe aluminijeve zlitine EN AW 2011 med toplotno obdelavo s pomočjo štiri-točkovne metode, kjer se za merjenje upornosti vzorcev uporablja štiri-stopenjska sonda in enosmerni tokovni vir. Določili smo ne le temperaturna območja sprememb, temveč smo s SEM-EDS analizami, Thermo-Calc analizo in DSC analizo tudi prišli do sklepov o dogajanju v temperaturnih območjih.

• Language: Slovenian
• Keywords: aluminijeva zlitina EN AW 2011, toplotna obdelava, električna upornost, mikrostruktura
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Place of publishing: Ljubljana
• Publisher: [M. Kropec]
• Year: 2022
• Number of pages: XIII, 51 f.
• PID: 20.500.12556/RUL-137805
• UDC: 669.187.25(043.2)
• COBISS.SI-ID: 129257475
• Publication date in RUL: 01.07.2022

KROPEC, Melanja, 2022, Zaznavanje mikrostrukturnih sprememb med toplotno obdelavo Al zlitine 2011 z merjenjem električne upornosti : diplomsko delo [online]. Bachelor’s thesis. Ljubljana : M. Kropec. [Accessed 25 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=137805

Secondary language

• Language: English
• Title: Detection of microstructural changes during heat treatment of Al alloy 2011 by measuring electrical resistivity : diploma work

Abstract

Aluminium is called the metal of the modern age because of its ideal properties. 2xxx series aluminium wrought alloys are characterized by poorer corrosion resistance and good strength properties. Copper, as the main alloying element, provides strength over a wide temperature range. It is very suitable for use on automatic lathes, where complex and detailed parts can be produced. Electrical conductivity is a property of a material that describes its ability to move electrically charged particles. It is influenced by temperature, crystal structure or number of free electrons, mobility and thus the average velocity of the electron. The resistance that electrons encounter during motion is called electrical resistance. In the diploma thesis we detected microstructural changes of aluminium alloy EN AW 2011 during heat treatment using a four-point method, where a four-stage probe and a direct current source are used to measure the resistance of the samples. We determined not only the temperature ranges of changes, but with SEM-EDS analysis, Thermo-Calc analysis and DSC analysis we came to conclusions about what is happening in the temperature ranges.

• Keywords: Aluminium alloy EN AW 2011, heat treatment, electrical resistance, microstructure