十八层地狱里视频:300分工科材料类英文论文求好翻译

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Al alloys containing high Zn content are being
applied as structural material in many industrial ap-
plications because of their excellent combination of
good castability, mechanical properties, and wear
resistance [1一
For the supersaturated solid solutions of A]-Zn
alloys containing 16.5 at.% to 59.0 at.% Zn, spinodal
decomposition occurs firstly during the process of
cooling; then the discontinuous precipitation (DP)
also takes place below 2770C [5-7]. The cellular nu-
cleus of DP form at the original grain boundary, then
swallow up the matrix spinodal by the migration of
cellular boundary, and finally develop into the fine
lamellar mixture of AI-rich and Zn-rich solid solu-
tions [8-10]. This kind of dual phase microstructure
was firstly found in steels, which was called pearlite
[ 11 ]. The pearlite in steels changes into spherical
而crostructure during subsequent heat treatment.
However, it has been found that the fine lamellar
microstructure of DP in AI-Zn alloys transformed
into the coarsening lamellar one through the mecha-
nism of nucleation and growth. The nucleus of the
kinetics of DP were investigated in order to deeply
understand the thermal stability of DP
2 Experimental procedure
Experimental alloys were made by melting pure
Al (99.99%), pure Zn (99.99%), and pure Cu
(99.999%) in an alumina crucible in high purity and
then casting into a steel die. The mass of an ingot
was 300 g. According to the Al-Zn binary phase
diagram [6], the nominal compositions of the AI-Zn
alloy and the AI-Zn-Cu alloy were 60A1-40Zn (at.%,
called AIZn alloy) and 59A1-39Zn-2Cu (at.%, called
A1Zn-2Cu alloy). It was expected that the volume
fractions of Al-rich and Zn-rich phases by spinodal
decomposition in these alloys were about 50%, re-
specuvely. The compressed ingots underwent the
homogeneous treatment of 3750C x 24 h and 4000C
x 120 h. After solution-treated at 4000C for 2 h, the
samples were respectively aged at 150, 200, 2500C
for a certain time and etched by the aqueous solution
of mixed acid (HF+HCl+HN03). Microstructure
observations were carried out by using Versamet-2
optical microscope and Phillips XL30 FEG scanning
electronic microscope. X-ray diffraction was carried
out on the D/Max-Ra X-ray diffractometer of RI-
GAKU, and Ka diffraction rays of Cu target was
adopted.
3 Results and Discussion
3.1 Coarsening mechanism of DP microstructure
in the alloys