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Title:Vpliv pogojev strjevanja na mikrostrukturo zlitin in kompozitov s sestavo AlSi17Cu5
Authors:ID Lojen, Gorazd (Author)
ID Anžel, Ivan (Author)
ID Križman, Alojz (Author)
ID Inštitut za kovinske materiale in tehnologije (Copyright holder)
Files:.pdf Materiali_in_tehnologije_2001_Lojen,_Anzel_Vpliv_pogojev_strjevanja_na_mikrostrukturo_zlitin_in_kompozitov_s_sestavo_AlSi17Cu5.pdf (367,24 KB)
MD5: D581B83C0D4B56891917EA06184C062D
PID: 20.500.12556/dkum/0ce9eaa7-3ae8-4c55-8cc6-e12c8020399a
 
URL http://mit.imt.si/Revija/izvodi/mit0112/lojen.pdf
 
Language:Slovenian
Work type:Scientific work
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Abstract:Mikrostrukture zlitin v litem stanju so, razen od kemijske sestave, odvisne od procesnih parametrov, ki opredeljujejo razmere pri strjevanju. Najvplivnejša sta hitrost ohlajanja in gibanje taline med strjevanjem. Klasični postopki litja dopuščajo le relativno majhen vpliv na hitrost ohlajanja, saj je le-ta okvirno določena že z izbiro postopka (litje v pesek, litje v kokile, tlačno litje ...). Gibanje taline je omejeno na vrtinčenje, ki je posledica ulivanja v formo. V večini primerov je kratkotrajno in prešibko, da bi imelo večji vpliv na mikrostrukturo. Večina postopkov priprave materialov za predelavo v delno staljenem stanju temelji na intenzivnem gibanju taline med strjevanjem, ki omogoča ravoj nedendritne, globulitne morfologije primarnih trdnih faz. Pri teh postopkih je mogoče variirati dva procesna parametra: hitrost ohlajanja in hitrost mešanja. Kljub temu so faze v materialu in zaporedje njihove kristalizacije še vedno skladne s faznim diagramom in s sestavo zlitine. Izbrani hitrosti ohlajanja in mešanja opredeljujeta podobne pogoje nukleacije in rasti za vse faze, ki kristalizirajo iz taline med mešanjem. Bistvenio različne pogoje za nukleacujo in rast delcev posameznih faz v materialih je mogoče izbirati le, če material izdelamo kot kompozit. S postopkom sinteze delno staljenih mešanic je mogoče izdelati materiale, ki vsebujejo več primarnih faz, pri čemer lahko delcem vsake od teh faz predpišemo drugačno obliko in velikost. V tem prispevku obravnavamo mikrostrukture različnih materialov s povprečno kemijsko sestavo AlSi17Cu5: mikrostrukture različno hitro (brez mešanja) strjenih zlitin, zlitine, strjene med mešanjem, in kompozitov, izdelanih s sintezo delno staljenih mešanic.
Keywords:metalurgija, morfologija primarnih faz, vpliv procesnih parametrov, hitrost ohlajanja, mešanje v delno staljenem stanju, kompoziti s kovinsko matico, delno staljene mešanice, večfazne mešanice, sinteza delno staljenih mešanic
Publication status:Published
Publication version:Version of Record
Year of publishing:2001
Number of pages:str. 37-45
Numbering:Letn. 35, št. 1/2
PID:20.500.12556/DKUM-27964 New window
ISSN:1580-2949
UDC:669.018.95:669.71:620.18:621.746
ISSN on article:1580-2949
COBISS.SI-ID:6206486 New window
NUK URN:URN:SI:UM:DK:6UWNFGE3
Publication date in DKUM:01.06.2012
Views:2405
Downloads:100
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
LOJEN, Gorazd, ANŽEL, Ivan and KRIŽMAN, Alojz, 2001, Vpliv pogojev strjevanja na mikrostrukturo zlitin in kompozitov s sestavo AlSi17Cu5. Materiali in tehnologije [online]. 2001. Vol. 35, no. 1/2, p. 37–45. [Accessed 15 March 2025]. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=27964
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 New window

Secondary language

Language:English
Title:Influence of solidification conditions on the microstructure of Al 17wt.%Si 5wt.%Cu alloys and composites
Abstract:The microstuctures of as-cast alloys depend not only on their chemical composition, they are also strongly affected by process parameters that determine the solidification conditions. The most important of these are the cooling rate and the melt motion during solidification. Traditional csting methods only allow for small variations in the cooling rate, which is more or less determined by the choice of casting method (sand casting, gravity casting in permament moulds, pressure casting). Motion during the solidification is limited to the circulation caused by pouring the melt into the mould. In most cases it is of short duration and too weak to affect the microstructure significantly. The majority of techniques for producing materials with a non-dendritic microstructure (required for thixo casting, thixo forging...) are based on intensive circulation (stirring) during solidification. These techniques afford control of two important production parameters: coolin rate and stirring speed. Nevettheless, the crystallization sequence and the phases present in the materials are still determined by alloy phase diagrams and chemical composition. The chosen cooling rate and stirring speed result in similar nucleation and growth conditions for all phases crystallizing in the stirred melt. Totally different nucleation and growth conditions for differentphases can only br assured if the material is made as a composite. By the "synthesis of semi-solid mixtures" it is possible to manufacture materials containing several primary phases of the corresponding phase diagram. In addition, this production technique enables the individual control of particle size and morphology for each primary phase in the composite. In this paper, microstructures of several Al 17wt.%Si 5wt.%Cu materials are discussed: three samples were solidified under different coolingrates without forced convection, one was stirred in the semi solid state and two are composites made by the "synthesis of semi-solid mixtures".
Keywords:metallurgy, primary phase morphology, influence of process parameters, cooling rate, stirring in semi-solid state, metal matrix composites, semi solid mixtures, multiphase mixtures, synthesis of semi solid mixtures


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