Influence of initial microstructure of aluminium alloy charge after its melting on the hard metal inherited structure
DOI:
https://doi.org/10.31498/2225-6733.31.2015.70151Keywords:
aluminum, quasi-crystal, cluster, «gene» of crystallization, additional meltingAbstract
Metal properties heredity in the chain- initial hard state > liquid state > final solidified state has always been interesting for metallurgists. It is known that after the primary melting of charge there occurs microheterogenеous non-equilibrium melt with crystal-like groups of atoms and disordered area in it. With increase in temperature the melt approaches the equilibrium microhomogeneous state. The aim of this work is to study the charge microstructure influence on melt fluidity in the light of quasi-crystal model of liquid structure. Influence of isothermal heating on fluidity of aluminium melt, smelted from fine-grained and coarse-grained charge has been investigated. It has been stated that for coarse-grained metal additional melting of crystallization «genes» takes place in 1,4-quick time, as compared to fine-grained. The coefficients of exponential function for our experimental data have been calculated. It has been stated that the exponent depends on the charge microstructure, and multiplier depends on the soaking temperature. On the basis of A. Einstein equation for the calculation of liquid viscosity from the known fraction of admixtures and clean liquid viscosity an analogical equation for fluidity and calculation of quasi-crystals volume share in the melt have been derived. It has been found that the charge grain size affects the speed of quasi-crystals additional melting in the melt. The reference amount of quasi-crystals at the initial moment of large- and fine-grained charge melting has been calculated from our metallographic, experimental and estimated dataReferences
Никитин В.И. Перспективы технологий генной инженерии в расплавах / В.И. Никитин // Литейное производство. – 1999. – № 1. – С. 5-9.
Скребцов А.М. Поведение кластеров металлического расплава при его нагреве до высоких температур / А.М. Скребцов // Научные проблемы современной металлургии. – Мариуполь : ПГТУ, 2007. – С. 36-55.
Скребцов А.М. Жидкие металлы. Их свойства и строение : учебное пособие для ВУЗов / А.М. Скребцов. – Мариуполь, ПГТУ, 2010. – 252 с.
Изучение структурных перестроек в жидких металлах на модельном сплаве / А.М. Скребцов [и др.] // Вісник Приазовського державного технічного університету : Зб. наук. пр. / ПДТУ. – Маріуполь, 2008. – Вип. 18. – С. 61-65.
Готгильф Т.Л. Исследование влияния гистерезиса вязкости в металлических расплавах / Т.Л. Готгильф, А.П. Любимов // Физическая химия металлургических процессов и систем. МИСиС, сб. 41. – М. : Металлургия, 1966. – С. 160-170.
Еланский Г.Н. Строение и свойства металлических расплавов / Г.Н. Еланский. – М. : Металлургия, 1991. – 158 с.
Жидкая сталь / Б.А. Баум [и др.]. – М. : Металлургия, 1991. – 158 с.
Ершов Г.С. Строение и свойства жидких и твердых металлов / Г.С. Ершов, В.А. Черняков. – М. : Металлургия, 1978. – 248 с.
Ершов Г.С. Структурообразование и формирование свойств металлов и сплавов / Г.С. Ершов, Л.А. Позняк. – К. : Наукова думка, 1993. – 380 с.
Епифанов Г.И. Физика твердого тела / Г.И. Епифанов. – М. : Высшая школа, 1965. – 276 с.
Рыжиков А.А. Некоторые особенности процесса плавления и структуры жидких металлов / А.А. Рыжиков, И.В. Гаврилин // Прогрессивная технология литейного производства. – Горький: Волго-Вятское книжное издательство, 1969. – С. 3-10.
Арсентьев П.П. Металлургические расплавы и их свойства / П.П. Арсентьев, Л.А. Коледов. – М. : Металлургия, 1976. – 376 с.
Downloads
How to Cite
Issue
Section
License
The journal «Reporter of the Priazovskyi State Technical University. Section: Technical sciences» is published under the CC BY license (Attribution License).
This license allows for the distribution, editing, modification, and use of the work as a basis for derivative works, even for commercial purposes, provided that proper attribution is given. It is the most flexible of all available licenses and is recommended for maximum dissemination and use of non-restricted materials.
Authors who publish in this journal agree to the following terms:
1. Authors retain the copyright of their work and grant the journal the right of first publication under the terms of the Creative Commons Attribution License (CC BY). This license allows others to freely distribute the published work, provided that proper attribution is given to the original authors and the first publication of the work in this journal is acknowledged.
2. Authors are allowed to enter into separate, additional agreements for non-exclusive distribution of the work in the same form as published in this journal (e.g., depositing it in an institutional repository or including it in a monograph), provided that a reference to the first publication in this journal is maintained.
