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Effects of Ultrasonic Vibration on Microstructure and Mechanical...
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超声振动对Mg-6Zn-1.4Y合金组织和性能的影响,方晓刚,吴树森,如果能细化Mg-Zn-Y合金组织中初生α-Mg相和稳定的二十面体准晶I相,那么该合金将具有广阔的应用前景。本文主要研究了超声振动对流变�
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中国科技论文在线
Effects of Ultrasonic Vibration on Microstructure and
Mechanical Properties of Mg-6Zn-1.4Y Alloy
#
FANG Xiaogang, WU Shusen, LV Shulin, WANG Jing, ZHAO Li
**
5
(State Key Lab of Material Processing and Die & Mould Technology, Huazhong University of
Science and Technology, Wuhan 430074)
Foundations: Specialized Research Fund for the Doctoral Program of Higher Education (NO.20120142110002)
Brief author introduction:FANG Xiaogang(1989-),Male,Doctoral Student,Semisolid casting
Correspondance author: WU Shusen(1961-),Male,Professor,Semisolid casting. E-mail: [email protected]
Abstract: Mg-Zn-Y alloys containing a thermally stable icosahedral quasicrystal phase (I-phase) will
have wide application future on condition that primary α-Mg dendrite and the I-phase can be refined
during the casting process. In this research, the effects of ultrasonic vibration (USV) on the 10
microstructure and mechanical properties of the rheo-squeeze casting (RSC) Mg-6Zn-1.4Y alloys have
been investigated. The Mg alloy melt was exposed to ultrasonic vibration (USV) with different acoustic
power densities from 0 W/mL to 9 W/mL, and then the slurry was formed by squeeze casting. The
results show that good semi-solid slurry with fine and spherical α-Mg particles could be obtained with
the acoustic power density of 6 W/mL, and the average grain size and shape factor of primary α-Mg 15
were 32 μm and 0.76, respectively. Meanwhile the coarse eutectic I-phase (Mg
3
Zn
6
Y) was refined
obviously and dispersed uniformly. Compared with the samples without USV, the tensile strength and
elongation of the RSC casting samples with 6 W/mL acoustic power density were elevated by 10.6%
and 55.5%, respectively.
Key words: Metal materials; Mg-Zn-Y alloy; ultrasonic vibration; rheo-squeeze casting; quasicrystal 20
phase
0 Introduction
Mg-Zn-Y alloys containing a thermally stable icosahedral quasicrystal phase have attracted
tremendous attention in recent years due to their high strength both at room and elevated 25
temperatures
[1]
. The stable icosahedral quasicrystal phase (I-phase) was first reported in Mg-Zn-Y
alloys by Luo et al.
[2]
. The I-phase (Mg
3
Zn
6
Y) has a number of exceptional characteristics
including high hardness, low surface energy and excellent high-temperature plasticity
[1,3]
.
However, the conventional Mg-Zn-Y castings exhibit unsatisfactory mechanical properties due to
the coarse and continuous agglomeration of I-phase at grain boundaries. The I-phase can be 30
unifomly distributed through thermo-mechanical processes, such as hot extrution, hot rolling and
hot forging. Rheo-squeeze casting (RSC) is a novel and promising semisolid process capable of
producing castings with good mechanical properties. Ultrasonic vibration (USV) has been
successfully applied to produce the semisolid slurry of Al alloys for RSC process
[4]
. Jian et al.
[5]
observed that both the primary -Al and eutectic silicon in A356 alloy could be refined using 35
USV, but the mechanism of eutectic silicon modification under USV was not discussed.
In this study, Mg-Zn-Y alloy was fabricated by RSC process and the effect of USV on the
microstructure and tensile properties was discussed.
1 Experimental details
The chemical compositions of Mg-Zn-Y magnesium alloy are Zn 6% (wt. %, the same in the 40
following), Y 1.4%, Zr 0.6% and Mg balance. The raw materials were melted in a mild steel
crucible at 750 °C under mixed atmosphere of SF
6
and N
2
with the volume ratio of 1:99. An USV
apparatus for preparing semisolid slurry was applied in the experiment, which was developed by
our research group
[6]
. It mainly contains an ultrasonic generator, a piezoceramic transducer, a
titanium sonotrode and a heating furnace. The ultrasonic power can be adjusted from 0 W to 2000 45
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