Phase-structural state of τ-MnAl(Ga) alloys prepared at different cooling rates

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An alloy with a nominal composition of Mn55Al36Ga9 is prepared by four different methods which ensure different cooling rates. Two bulk samples are prepared by induction melting followed by water quenching from a homogenizing temperature of 1100oС; one of the samples was sealed in a quartz ampoule and subjected to water quenching, whereas the other sample directly was subjected to water quenching. Two samples are prepared in the form of ribbons by quenching from the melt on a rotating copper wheel at linear speeds of 10 and 40 m/s. Thus, samples quenched at different rates are prepared. For these samples, regularities of phase transitions occurred during heating are determined, and difference in the regularities for the bulk and rapidly quenched samples are found. Based on the data obtained, we make an assumption that the γ2 → τ phase transition has features of a bulk transition. Magnetic hysteretic properties of the rapidly quenched ribbons are measured. The high thermal stability of the rapidly quenched ribbons alloyed with gallium is shown.

作者简介

A. Fortuna

National University of Science and Technology MISiS

编辑信件的主要联系方式.
Email: fortuna.as@misis.ru
俄罗斯联邦, Moscow, 119049

N. Vazhinskii

National University of Science and Technology MISiS

Email: fortuna.as@misis.ru
俄罗斯联邦, Moscow, 119049

K. Nechaev

National University of Science and Technology MISiS

Email: fortuna.as@misis.ru
俄罗斯联邦, Moscow, 119049

T. Morozova

National University of Science and Technology MISiS

Email: fortuna.as@misis.ru
俄罗斯联邦, Moscow, 119049

M. Gorshenkov

National University of Science and Technology MISiS

Email: fortuna.as@misis.ru
俄罗斯联邦, Moscow, 119049

D. Karpenkov

National University of Science and Technology MISiS

Email: fortuna.as@misis.ru
俄罗斯联邦, Moscow, 119049

E. Malyutina

National University of Science and Technology MISiS

Email: fortuna.as@misis.ru
俄罗斯联邦, Moscow, 119049

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