Effect of manganese and zirconium additions on the structure and superplasticity of AK4-1 type alloys

A.D. Kotov, A.V. Mikhaylovskaya, V.K. Portnoy
Accepted: 24 April 2013
This paper is written in Russian
Citation: K. A.D., M. A.V., P. V.K.. Effect of manganese and zirconium additions on the structure and superplasticity of AK4-1 type alloys. Letters on Materials, 2013, 3(2) 118-121
BibTex   DOI: 10.22226/2410-3535-2013-2-118-121

Abstract

The grain structure and superplasticity of sheets of alloys Al-Cu-Mg-Fe-Ni with 0,25 % Zr and both with 0,25%Zr and 0,8%Mn were investigated. It is shown that alloying of zirconium provides the average grain size in alloy of 2,5 µm, and the alloying simultaneously Zr and Mn - 5,2 µm. The value of the optimal rate of superplastic deformation of the alloy with 0,25 % Zr - 3∙10-3 s-1, with 0,25%Zr and 0,8%Mn - 1∙10-3 s–1, and elongation at optimum strain rate – 720 % and 320 %, respectively. It is shown that annealing in saltpeter before superplastic deformation provides a finer grain. Consequently, the maximum m shifts to higher strain rate, the elongation increases and the flow stress is reduced.

References (12)

1.
Новиков И.И., Портной В.К. Сверхпластичность спла-вов с ультрамелким зерном. М.: Металлургия, 1981,168 c.
2.
Nieh T.G., Wadsworth J., Sherby O.D. Superplasticity inmetals and ceramics. New York: Cambridge UniversityPress, 2005, P. 287.
3.
Humphreys F.J. and Hatherly M. Recrystallization andRelated Annealing Phenomena (Second Edition). NewYork: Elsevier Science, 2004, P. 628.
4.
Маркушев М.В. О принципах деформационных ме-тодов измельчения зерен алюминиевых сплавов доультрамелких размеров. I. Мелкозернистые сплавы.Физика металлов и металловедение, 2009, Т. 108, №1, С. 46 – 53.
5.
Елагин В.И. Легирование деформируемых алю-миниевых сплавов переходными металлами. М.:Металлургия, 1975. 248 с.
6.
Yong-yi P., Zhi-min Y., Bo N., Li Z. Effect of minor Scand Zr on superplasticity of Al-Mg-Mn alloys. Trans.Nonferrous Met. Soc. China, 2007, V. 17, P. 744-750.
7.
Jiang Li Ning, Da Ming Jiang. Influence of Zr additionon the microstructure evolution and thermal stabilityof Al–Mg–Mn alloy processed by ECAP at elevatedtemperature. Materials Science and Engineering A, 2007,V. 452–45, P. 552–557.
8.
Микляев П.Г. Механические свойства легких сплавовпри температурах и скоростях обработки давлением.М.: Металлургия, 1994, 288 с.
9.
Кайбышев О.А. Сверхпластичность промышленныхсплавов. М.: Металлургия, 1984, 264 с.
10.
Yu K., Li W., Li S., Zha J. Mechanical properties andmicrostructure of aluminum alloy 2618 with Al3(Sc, Zr)phases. Materials Science and Engineering, 2004, V. 368,P. 88-93.
11.
Feng W., Baiqing X., Yongan Z. et al. Microstructuralcharacterization of an Al–Cu–Mg alloy containing Fe andNi. J. of Alloys and Compounds, 2009, V. 487, P. 445-449.
12.
Котов А.Д., Михайловская А.В., Портной В.К.,Сагалова Т.Б.. Получение микрозеренной структурыи сверхпластичного состояния в сплавах системы Al–Cu–Mg–Fe–Ni. МиТОМ, 2012, №7, С. 19-23.