Utjecaj dodatka legiranih elemenata na mikrostrukturu i tvrdoću titana

master's thesis

• Title (english): Effect of alloying elements on the microstructure and hardness of titanium
• Author: Mihael Šipuš
• Mentor: Ljerka Slokar (mentor)
• Committee member: Zoran Glavaš (predsjednik povjerenstva)
• Committee member: Ljerka Slokar (član povjerenstva)
• Committee member: Stjepan Kožuh (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2015-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy; Physical Metallurgy

Abstract

U ovom radu proučavan je utjecaj dodatka legirnih elemenata na mikrostrukuru i tvrdoću titana. Eksperimentalni uzorci uključuju titan, te legure Ti 90Zr10, Ti80Zr20, Ti80Zr10Nb10 i Ti70Zr10Nb20, a pripremljeni su taljenjem i lijevanjem u laboratorijskoj elektrolučnoj peći u zaštitnoj atmosferi argona. Prije ispitivanja uzorci su metalografski pripremljeni ulaganjem u karbonsku masu, te su brušeni i polirani, a nakon ispitivanja tvrdoće Vickersovom metodom provedeno je nagrizanje. Mikrostruktura je proučavana na svjetlosnom mikroskopu. Kvantitativnom metalografskom analizom određeni su broj i veličina zrna. Detaljna analiza mikrostrukture provedena je pomoću skenirajućeg elektronskog mikroskopa s energetskodisperzijskim spektrometrom, te analizom pomoću difrakcije rentgenskih zraka. Parametri elementarne ćelije prisutnih faza izračunati su pomoću odgovarajućeg računalnog programa. Analiza mikrostrukture je pokazala da nelegirani titan ima α strukturu, dok se dodatkom veće količine cirkonija ona mijenja u dvofaznu. Dodatkom niobija postignuta je jednofazna β struktura. Mjerenja tvrdoće su pokazala da nelegirani titan ima puno niţu tvrdoću od ispitivanih legura, što ukazuje da mu dodatak ovih legirnih elementa značajno povećava tvrdoću. Prema dobivenim rezultatima, eksperimentalne legure imaju potencijal za daljnja istraţivanja u svrhu biomedicinske primjene.

Abstract (english)

In this work effect of alloying elements addition on the microstructure and hardness of titanium was investigated. Experimental samples including titanium, Ti90Zr10, Ti80Zr20, Ti80Zr10Nb10 and Ti70Zr10Nb20 alloys were prepared by melting and casting in laboratory arc furnace in argon atmosphere. Samples were mounted in conductive resin and metallographically prepared by grinding and polishing. After testing of ardness by Vickers method, all samples were etched for microscopic examinations. Microstructure was observed
by light microscope. Number of grains and their average size were determined by quantitative metallography. Microstructure in detail was investigated by scanning electron microscope with energy dispersive spectrometer, and X-ray diffraction analysis as well. Cell parameters of present phases were determined by corresponding computer program. Microstructural
analysis showed α phase structure of unalloyed titanium, which is partially transformed into β phase by higher zirconium addition resulting in two-phases microstructure. Addition of niobium single β phase was obtained. Hardness measurements revealed that unalloyed titanium exibits much lower hardness values the experimental alloys indicating that alloying
elements addition significantly increases its hardness. According to obtained results experimental alloys have potential to be further investigated for biomedical purpose.

• Keywords: titan; Ti-Zr legure; Ti-Zr-Nb legure; biomedicina; mikrostruktura; tvrdoća
• Keywords (english): titanium; Ti-Zr alloys; Ti-Zr-Nb alloys; biomedicine; microstructure; hardness
• Language: croatian
• URN:NBN: urn:nbn:hr:115:011352
• Study programme: Title: Graduate study program Metallurgy; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka metalurgije (magistar/magistra inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2015-10-15 10:33:16