The present work involves the study of the effect of precipitates on mechanical and tribological properties of AZ91 magnesium alloy. Optical microscopy, scanning electron microscopy (SEM), and nanoindentation were used to characterize the microstructures and mechanical properties of the alloy. In addition, the wear behavior of the alloy was deduced using a pin-on disk tribological configuration under unidirectional sliding against steel (AISI 250). The elastic modulus of AZ91 alloy was found to vary significantly with changing precipitation state. The tribological evaluations showed that the specific wear-rate of solutionized sample is lowest as compared to the aged samples. This was attributed to the absence of γ-Mg17Al12 phase. Examination of worn surfaces suggested that microploughing coupled with the adhesive mode of wear is the main wear mechanism in the aged samples.
Issue Section:
Friction & Wear
Topics:
Alloys,
Magnesium alloys,
Steel,
Tribology,
Wear,
Elastic moduli,
Stress,
Nanoindentation,
Friction,
Microhardness,
Adhesives
References
1.
Friedrich
, H.
, and Schumann
, S.
, 2001
, “Research for a ‘New Age of Magnesium’ in the Automotive Industry
,” J. Mater. Process. Technol.
, 117
(3
), pp. 276
–281
.10.1016/S0924-0136(01)00780-42.
Limited
, W. P.
, 2013
, Fundamentals of Magnesium Alloy Metallurgy
, Woodhead Publishing Limited
, New Delhi, India
.3.
Mordike
, B. L.
, and Ebert
, T.
, 2001
, “Magnesium Properties-Applications-Potential
,” Mater. Sci. Eng. A
, 302
(1
), pp. 37
–45
.10.1016/S0921-5093(00)01351-44.
Blau
, P. J.
, and Walukas
, M.
, 2000
, “Sliding Friction and Wear of Magnesium Alloy AZ91D Produced by Two Different Methods
,” Tribol. Int.
, 33
(8
), pp. 573
–579
.10.1016/S0301-679X(00)00108-05.
Dobrzanski
, L. A.
, Tanski
, T.
, Cizek
, L.
, and Domagała
, J.
, 2008
, “Mechanical Properties and Wear Resistance of Magnesium Casting Alloys
,” J. Achievements Mater. Manuf. Eng.
, 31
(1
), pp. 83
–90
.6.
Liu
, X.
, Zhang
, T.
, Shao
, Y.
, Meng
, G.
, and Wang
, F.
, 2012
, “Effect of Alternating Voltage Treatment on Corrosion Resistance of AZ91D Magnesium Alloy
,” Mater. Corros.
, 63
, pp. 505
–516
.10.1002/maco.2010059557.
Zeng
, R.
, Zhang
, J.
, Huang
, W.
, Dietzel
, W.
, Kainer
, K. U.
, Blawert
, C.
, and Ke
, W.
, 2006
, “Review of Studies on Corrosion of Magnesium Alloys
,” Trans. Nonferrous Met. Soc. China
, 16
(suppl. 2), pp. s763
–s771
.10.1016/S1003-6326(06)60297-58.
Chen
, H.
, and Alpas
, A. T.
, 2000
, “Sliding Wear Map for the Magnesium Alloy Mg-9Al-0.9 Zn (AZ91)
,” Wear
, 246
(1–2
), pp. 106
–116
.10.1016/S0043-1648(00)00495-69.
An
, J.
, Li
, R. G.
, Lu
, Y.
, Chen
, C. M.
, Xu
, Y.
, Chen
, X.
, and Wang
, L. M.
, 2008
, “Dry Sliding Wear Behavior of Magnesium Alloys
,” Wear
, 265
(1–2
), pp. 97
–104
.10.1016/j.wear.2007.08.02110.
Aung
, N. N.
, Zhou
, W.
, and Lim
, L. E. N.
, 2008
, “Wear Behaviour of AZ91D Alloy at Low Sliding Speeds
,” Wear
, 265
(5–6
), pp. 780
–786
.10.1016/j.wear.2008.01.01211.
Bourgeois
, L.
, Muddle
, B. C.
, and Nie
, J. F.
, 2001
, “The Crystal Structure of the Equilibrium Phase in Mg-Zn-Al Casting Alloys
,” Acta Mater.
, 49
(14
), pp. 2701
–2711
.10.1016/S1359-6454(01)00162-812.
Zhang
, M.
, and Kelly
, P. M.
, 2003
, “Crystallography of Mg17Al12 Precipitates in AZ91D Alloy
,” Scr. Mater.
, 48
(5
), pp. 647
–652
.10.1016/S1359-6462(02)00555-913.
Dobrzanski
, L. A.
, Tanski
, T.
, Cizek
, L.
, and Brytan
, Z.
, 2007
, “Structure and Properties of Magnesium Cast Alloys
,” J. Mater. Process. Technol.
, 192–193
, pp. 567
–574
.10.1016/j.jmatprotec.2007.04.04514.
Lai
, W. L.
, Li
, Y. Y.
, Hsu
, Y. F.
, Trong
, S.
, and Wang
, W. H.
, 2009
, “Aging Behaviour and Precipitate Morphologies in Mg–7.7Al–0.5Zn–0.3Mn (wt.%) Alloy
,” J. Alloys Compd.
, 476
(1–2
), pp. 118
–124
.10.1016/j.jallcom.2008.08.04315.
Braszczynska-Malik
, K. N.
, 2009
, “Discontinuous and Continuous Precipitation in Magnesium–Aluminium Type Alloys
,” J. Alloys Compd.
, 477
(1–2
), pp. 870
–876
.10.1016/j.jallcom.2008.11.00816.
Yuan
, G. Y.
, Liu
, Z. L.
, Wang
, Q. D.
, and Ding
, W. J.
, 2002
, “Microstructure Refinement of Mg – Al – Zn – Si Alloys
,” Mater. Lett.
, 56
(1–2
), pp. 53
–58
.10.1016/S0167-577X(02)00417-217.
Pai
, B. C.
, Pillai
, U. T. S.
, Manikandan
, P.
, and Srinivasan
, A.
, 2012
, “Modification of AZ91 Mg Alloys for High Temperature Applications
,” Trans. Indian Inst. Met.
, 65
(6
), pp. 601
–606
.10.1007/s12666-012-0166-118.
Zhou
, J. P.
, Zhao
, D. S.
, Wang
, R. H.
, Sun
, Z. F.
, Wang
, J. B.
, Gui
, J. N.
, and Zheng
, O.
, 2007
, “In Situ Observation of Ageing Process and New Morphologies of Continuous Precipitates in AZ91 Magnesium Alloy
,” Mater. Lett.
, 61
(25
), pp. 4707
–4710
.10.1016/j.matlet.2007.03.01319.
Tan
, M.
, Liu
, Z.
, and Quan
, G.
, 2012
, “Effects of Hot Extrusion and Heat Treatment on Mechanical Properties and Microstructures of AZ91 Magnesium Alloy
,” Energy Procedia
, 16
, pp. 457
–460
.10.1016/j.egypro.2012.01.07420.
Nie
, J. F.
, Xiao
, X. L.
, Luo
, C. P.
, and Muddle
, B. C.
, 2001
, “Characterisation of Precipitate Phases in Magnesium Alloys Using Electron Microdiffraction
,” Micron
, 32
(8
), pp. 857
–863
.10.1016/S0968-4328(00)00094-921.
Braszczynska
, K.
, 2011
, “Precipitates of γ –Mg17Al12 Phase in AZ91 Alloy
,” Magnesium Alloys—Design, Processing and Properties
, F.
Czerwinski
, ed., InTech
, Rijeka Croatia
, pp. 95
–112
.22.
Oliver
, W. C.
, and Pharr
, G. M.
, 1992
, “An Improved Technique for Determining Hardness and Elastic Modulus Using Load and Displacement Sensing Indentation Experiments
,” J. Mater. Res.
, 7
(6
), pp. 1564
–1583
.10.1557/JMR.1992.156423.
Sun
, Y.
, Liang
, J.
, Xu
, Z. H.
, Wang
, G.
, and Li
, X.
, 2007
, “Nanoindentation for Measuring Individual Phase Mechanical Properties of Lead Free Solder Alloy
,” J. Mater. Sci. Mater. Electron.
, 19
(6
), pp. 514
–521
.10.1007/s10854-007-9374-624.
ASMEC
, 2013
, User Guide, IndentAnalyser 2.0.25.
Celotto
, S.
, 2000
, “TEM Study of Continuous Precipitation in Mg–9 wt.%Al–1 wt%Zn Alloy
,” Acta Mater.
, 48
(8
), pp. 1775
–1787
.10.1016/S1359-6454(00)00004-526.
Celotto
, S.
, and Bastow
, T. J.
, 2001
, “Study of Precipitation in Aged Binary Mg-Al and Ternary Mg-Al-Zn Alloys Using 27Al NMR Spectroscopy
,” Acta Mater.
, 49
(1
), pp. 41
–51
.10.1016/S1359-6454(00)00305-027.
Clark
, J. B.
, 1968
, “Age Hardening in a Mg-9 wt.% Al Alloy
,” Acta Metall.
, 16
(2
), pp. 141
–152
.10.1016/0001-6160(68)90109-028.
Duly
, D.
, Simon
, J. P.
, and Brechet
, Y.
, 1995
, “On the Competition Between Continuous and Discontinuous Precipitates in Binary Mg-A1 Alloys
,” Acta Metall. Mater.
, 43
(1
), pp. 101
–106
.10.1016/0956-7151(95)90266-X29.
Sumitomo
, T.
, Caceres
, C. H.
, and Veidt
, M.
, 2002
, “The Elastic Modulus of Cast Mg–Al–Zn Alloys
,” J. Light Met.
, 2
(1
), pp. 49
–56
.10.1016/S1471-5317(02)00013-530.
Raynor
, G. V.
, 1959
, The Physical Metallurgy of Magnesium and Its Alloys
, Pergamon
, London, UK
.31.
Chen
, B.
, Lin
, D. L.
, Jin
, L.
, Zeng
, X. Q.
, and Lu
, C.
, 2008
, “Equal-Channel Angular Pressing of Magnesium Alloy AZ91 and Its Effects on Microstructure and Mechanical Properties
,” Mater. Sci. Eng. A
, 483–484
, pp. 113
–116
.10.1016/j.msea.2006.10.19932.
Chung
, C. W.
, Ding
, R. G.
, Chiu
, Y. L.
, and Gao
, W.
, 2010
, “Effect of ECAP on Microstructure and Mechanical Properties of Cast AZ91 Magnesium Alloy
,” J. Phys. Conf. Ser.
, 241
(1
), p. 012101
.10.1088/1742-6596/241/1/01210133.
Miyata
, N.
, and Jinno
, H.
, 1981
, “Strength and Fracture Surface Energy of Phase-Separated Glasses
,” J. Mater. Sci.
, 16
(8
), pp. 2205
–2217
.10.1007/BF0054238334.
Finkin
, E. F.
, 1978
, “An Explanation of the Wear of Metals
,” Wear
, 47
(1
), pp. 107
–117
.10.1016/0043-1648(78)90207-735.
Gao
, J.
, Luedtke
, W. D.
, Gourdon
, D.
, Ruths
, M.
, Israelachvili
, J. N.
, and Landman
, U.
, 2004
, “Frictional Forces and Amontons' Law: From the Molecular to the Macroscopic Scale
,” J. Phys. Chem. B
, 108
(11
), pp. 3410
–3425
.10.1021/jp036362l36.
Persson
, B. N. J.
, Sivebaek
, I. M.
, Samoilov
, V. N.
, Zhao
, K.
, Volokitin
, A. I.
, and Zhang
, Z.
, 2008
, “On the Origin of Amonton's Friction Law
,” J. Phys. Condens. Matter
, 20
(39
), p. 395006
.10.1088/0953-8984/20/39/39500637.
Chan
, S. M. T.
, Neu
, C. P.
, Komvopoulos
, K.
, and Reddi
, A. H.
, 2011
, “Dependence of Nanoscale Friction and Adhesion Properties of Articular Cartilage on Contact Load
,” J. Biomech.
, 44
(7
), pp. 1340
–1345
.10.1016/j.jbiomech.2011.01.00338.
Busuttil
, K.
, Geoghegan
, M.
, Hunter
, C. A.
, and Leggett
, G. J.
, 2011
, “Contact Mechanics of Nanometer-Scale Molecular Contacts: Correlation between Adhesion, Friction, and Hydrogen Bond Thermodynamics
,” J. Am. Chem. Soc.
, 133
(22
), pp. 8625
–8632
.10.1021/ja201114339.
Jagota
, A.
, and Hui
, C.-Y.
, 2011
, “Adhesion, Friction, and Compliance of Bio-Mimetic and Bio-Inspired Structured Interfaces
,” Mater. Sci. Eng. R Rep.
, 72
(12
), pp. 253
–292
10.1016/j.mser.2011.08.001.40.
Kendall
, K.
, 1971
, “The Adhesion and Surface Energy of Elastic Solids
,” J. Appl. Phys. D: Appl. Phys.
, 4
(8
), pp. 1186
–1195
.10.1088/0022-3727/4/8/32041.
Dubois
, J. M.
, and Belin-Ferre
, E.
, 2014
, “Friction and Solid–Solid Adhesion on Complex Metallic Alloys
,” Sci. Technol. Adv. Mater.
, 15
(3
), p. 034804
.10.1088/1468-6996/15/3/03480442.
Mehta
, D. S.
, Masood
, S. H.
, and Song
, W. Q.
, 2004
, “Investigation of Wear Properties of Magnesium and Aluminum Alloys for Automotive Applications
,” J. Mater. Process. Technol.
, 155–156
, pp. 1526
–1531
.10.1016/j.jmatprotec.2004.04.247Copyright © 2015 by ASME
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