4852

4556

كارشناسي ارشد

استخراج فلزات

اصفهان:دانشگاه صنعتي اصفهان،دانشكده مواد

1388

[هشت]،105ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

مسعود پنجه پور،محمود مرآتيان

24/9/88

احمد ساعتچي،مهدي احمديان

مهندسي مواد

ID4556

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Synthesis of FeAl Intermetallic Compound by the Solid Liquid Reaction Method Mahdi fourajanizadeh m forujani@ma iut ac ir June 15 2009 Department of materials engineering Isfahan university of technologyDegree M Sc Language FarsiMasoud Panjepour panjepour@cc iut ac irMahmoud Meratian meratian@cc iut ac irAbstractFerrous aluminides are one of the most important substitution materials for super alloys Inthis case FeAl intermetallic compound has very specific applications in strategicsituations Solid synthesis method is usually used for the production of this compound which has low formation kinetic rate However using mechanical ball milling processbefore heat treatment process is caused the formation rate to be increased dramatically So the main purpose of this work is investigating the effect of applying mechanical andthermal activating factors on the formation of FeAl compound by using high temperatureball milling In this investigation pure Fe and Al powders were mixed by the stoichiometric ratio in therange of the formation of FeAl compound This mixture was ball milled with the ball topowder ratio of 20 1 in Argon atmosphere At first after optimizing the millingparameters the powder mixtures were hot milled at 700 and 800 C in the range of Fe andAl melting point for times ranging from 3 to 9 hr In this temperature the reactant phase Al is in molten phase and Fe phase in the solid state In order to investigating the effect of temperature and time EDX SEM and XRD testswere conducted on the powder mixtures At second stage the powder mixture was finallytested by DTA test heating rate of 10 C min Argon atmosphere isothermal test at700 C Argon atmosphere and SHS on the cylindrical compacted powder specimens inorder to study the formation mechanism of the compound Results showed that the homogenous single phase FeAl intermetallic compound isachieved by 6 h milling of Fe Al powder mixture molar ratio of Fe Al 1 at 800 C Moreover results showed that the formation mechanism of this compound involves twomain stages The first stage includes the reaction of liquid Al and solid Fe and theformation of Fe2Al5 intermetallic compound Second stage includes the diffusion of Fe andAl to the Fe2Al5 compound and the formation of FeAl intermetallic compound Finally it s concluded that the diffusion process is the most important controlling factor in the rateof formation of FeAl compound after primitive reaction Key WordsIron Aluminides Intermetallic Solid Liquid Reaction Hot milling Synthesis

مسعود پنجه پور،محمود مرآتيان

احمد ساعتچي،مهدي احمديان