Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys

Microstructure of Al–Cu–Yb and Al-Cu-Gd alloys at casting, hot-rolled -cold-rolled and annealed state were observed; the effect of annealing on the microstructure was studied, as were the mechanical properties and forming properties of the alloys, and the mechanism of action was explored. Analysis o...

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Main Authors:	Sayed Amer, Ruslan Barkov, Andrey Pozdniakov
Format:	Article
Language:	English
Published:	MDPI AG 2021-03-01
Series:	Metals
Subjects:	aluminum alloys ytterbium gadolinium quasi-binary alloys mechanical properties
Online Access:	https://www.mdpi.com/2075-4701/11/3/476

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spelling	doaj-5b0f38b9bac849d89bc0a723990085972021-03-14T00:02:31ZengMDPI AGMetals2075-47012021-03-011147647610.3390/met11030476Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd AlloysSayed Amer0Ruslan Barkov1Andrey Pozdniakov2Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology “MISIS”, Leninskiy pr. 4, 119049 Moscow, RussiaDepartment of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology “MISIS”, Leninskiy pr. 4, 119049 Moscow, RussiaDepartment of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology “MISIS”, Leninskiy pr. 4, 119049 Moscow, RussiaMicrostructure of Al–Cu–Yb and Al-Cu-Gd alloys at casting, hot-rolled -cold-rolled and annealed state were observed; the effect of annealing on the microstructure was studied, as were the mechanical properties and forming properties of the alloys, and the mechanism of action was explored. Analysis of the solidification process showed that the primary Al solidification is followed by the eutectic reaction. The second Al<sub>8</sub>Cu<sub>4</sub>Yb and Al<sub>8</sub>Cu<sub>4</sub>Gd phases play an important role as recrystallization inhibitor. The Al<sub>3</sub>Yb or (Al, Cu)<sub>17</sub>Yb<sub>2</sub> phase inclusions are present in the Al-Cu-Yb alloy at the boundary between the eutectic and aluminum dendrites. The recrystallization starting temperature of the alloys is in the range of 250–350 °C after rolling with previous quenching at 590 and 605 °C for Al-Cu-Yb and Al-Cu-Gd, respectively. The hardness and tensile properties of Al-Cu-Yb and Al-Cu-Gd as-rolled alloys are reduced by increasing the annealing temperature and time. The as-rolled alloys have high mechanical properties: YS = 303 MPa, UTS = 327 MPa and El. = 3.2% for Al-Cu-Yb alloy, while YS = 290 MPa, UTS = 315 MPa and El. = 2.1% for Al-Cu-Gd alloy.https://www.mdpi.com/2075-4701/11/3/476aluminum alloysytterbiumgadoliniumquasi-binary alloysmechanical properties
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Sayed Amer Ruslan Barkov Andrey Pozdniakov
spellingShingle	Sayed Amer Ruslan Barkov Andrey Pozdniakov Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys Metals aluminum alloys ytterbium gadolinium quasi-binary alloys mechanical properties
author_facet	Sayed Amer Ruslan Barkov Andrey Pozdniakov
author_sort	Sayed Amer
title	Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys
title_short	Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys
title_full	Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys
title_fullStr	Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys
title_full_unstemmed	Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys
title_sort	microstructure and mechanical properties of novel quasibinary al-cu-yb and al-cu-gd alloys
publisher	MDPI AG
series	Metals
issn	2075-4701
publishDate	2021-03-01
description	Microstructure of Al–Cu–Yb and Al-Cu-Gd alloys at casting, hot-rolled -cold-rolled and annealed state were observed; the effect of annealing on the microstructure was studied, as were the mechanical properties and forming properties of the alloys, and the mechanism of action was explored. Analysis of the solidification process showed that the primary Al solidification is followed by the eutectic reaction. The second Al<sub>8</sub>Cu<sub>4</sub>Yb and Al<sub>8</sub>Cu<sub>4</sub>Gd phases play an important role as recrystallization inhibitor. The Al<sub>3</sub>Yb or (Al, Cu)<sub>17</sub>Yb<sub>2</sub> phase inclusions are present in the Al-Cu-Yb alloy at the boundary between the eutectic and aluminum dendrites. The recrystallization starting temperature of the alloys is in the range of 250–350 °C after rolling with previous quenching at 590 and 605 °C for Al-Cu-Yb and Al-Cu-Gd, respectively. The hardness and tensile properties of Al-Cu-Yb and Al-Cu-Gd as-rolled alloys are reduced by increasing the annealing temperature and time. The as-rolled alloys have high mechanical properties: YS = 303 MPa, UTS = 327 MPa and El. = 3.2% for Al-Cu-Yb alloy, while YS = 290 MPa, UTS = 315 MPa and El. = 2.1% for Al-Cu-Gd alloy.
topic	aluminum alloys ytterbium gadolinium quasi-binary alloys mechanical properties
url	https://www.mdpi.com/2075-4701/11/3/476
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Microstructure and Mechanical Properties of Novel Quasibinary Al-Cu-Yb and Al-Cu-Gd Alloys

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