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Settling and Agglomeration ofTiB2 Particles in Al-Cu Alloy A205
Jönköping University, School of Engineering, JTH, Mechanical Engineering.
2017 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The use of aluminium as a castable material has increased in the automotive and aerospace industries to reduce weight, harmful emissions and to improve the efficiency of vehicles. The Al-Cu alloy, which is designated as A205 containing high levels of grain refining particles as TiB2 from the Al-Ti-B system is believed, as a potential replacement of titanium and other aluminium alloys such as A357 commonly used in the aerospace industry if the settling mechanism can be controlled to produce desired homogenous properties.

The settling behavior of TiB2 particles through the A205 Alloy containing 5wt% TiB2 as well as Al-4Cu alloys with additions of titanium diboride particles through the Al-Ti-B containing between 0.5wt% to 3wt% of TiB2 in liquid aluminum has been studied by casting at 700oC and vertically with optical microscopy, some of the results were confirmed using chemical analysis by a Scanning electron microscope (SEM). The results obtained were coherent with earlier studies with an exception of how the amount of grain refining particles behaves during settling in larger amounts. The analyzed results indicated that a larger amount of particles delay the settling mechanism and that settling occurs constantly throughout the whole vertical samples, the grain size seems to be reduced depending on the amount of grain refining particles as well as the holding time. Stokes’ Law has been used to produce theoretical settling times and correlated to the practical data of the experiments.

Abstract [sv]

Användningen av gjut- aluminium har ökat inom fordons och flyg/rymd- industrin för att minska vikt, utsläpp och för att förbättra effektiviteten hos fordon. Al-Cu legeringen A205 innehållande höga nivåer av kornförfiningspartiklarna TiB2 från Al-Ti-B systemen tros kunna ersätta titan och andra aluminium legeringar såsom A357, vilket vanligt används inom flyg- och rymd- industrin om sedimentations mekanismer kan kontrolleras för att producera de önskvärda och homogena egenskaperna.

Sedimentations beteende hos TiB2- partiklar från den kommersiella legeringen A205 innehållande 5wt% TiB2 samt Al-4Cu legeringar med tillsatser av TiB2 från Al-Ti-B kornförfiningssystemet innehållande mellan 0.5wt% till 3wt% TiB2 i flytande aluminium har undersökts genom gjutning vid 700oC och vertikalt med optiskt mikroskopi, några av de producerade resultaten konfirmerades genom kemiska analyser från svep elektron mikroskop (SEM). De producerade resultaten stämmer överens med tidigare undersökningar med ett undantag för hur mängden TiB2 partiklar berör sedimentationens beteende. De analyserade resultaten visade att högre nivåer av TiB2 fördröjer sedimentationens beteende och att sedimentationen sker konstant genom hela proverna, kornstorleken verkar bli mindre beroende på mängden partiklar och hålltider. Stokes lag har använts för att producera teoretiska sedimentations- tider och sedan jämförts med praktisk data från experimenten.

Place, publisher, year, edition, pages
2017. , p. 49
Keywords [en]
A205 alloy, Cast aluminium, Agglomeration, Settling, Grain refinement, Microstructure, Titanium diboride
Keywords [sv]
A205 legering, aluminium gjutning, Agglomeration, Settling, Kornförfining, Microstruktur, Titandiborid
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:hj:diva-37907ISRN: JU-JTH-MTA-1-20170126OAI: oai:DiVA.org:hj-37907DiVA, id: diva2:1159608
Subject / course
JTH, Mechanical Engineering
Supervisors
Examiners
Available from: 2017-11-24 Created: 2017-11-23 Last updated: 2017-11-24Bibliographically approved

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