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.

References

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)00780-4
2.
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)01351-4
4.
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)00108-0
5.
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.201005955
7.
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)60297-5
8.
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)00495-6
9.
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.2007.08.021
10.
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.2008.01.012
11.
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)00162-8
12.
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)00555-9
13.
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.2007.04.045
14.
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.2008.08.043
15.
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.2008.11.008
16.
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)00417-2
17.
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/s12666-012-0166-1
18.
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.2007.03.013
19.
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.2012.01.074
20.
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)00094-9
21.
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.1992.1564
23.
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/s10854-007-9374-6
24.
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)00004-5
26.
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)00305-0
27.
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)90109-0
28.
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-X
29.
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)00013-5
30.
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.2006.10.199
32.
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
.10.1088/1742-6596/241/1/012101
33.
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/BF00542383
34.
Finkin
,
E. F.
,
1978
, “
An Explanation of the Wear of Metals
,”
Wear
,
47
(
1
), pp.
107
117
.10.1016/0043-1648(78)90207-7
35.
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/jp036362l
36.
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
.10.1088/0953-8984/20/39/395006
37.
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.2011.01.003
38.
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/ja2011143
39.
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
.10.1088/0022-3727/4/8/320
41.
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
.10.1088/1468-6996/15/3/034804
42.
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.2004.04.247
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