热处理工艺对7090%2fSiCp复合材料组织和性能的影响.pdf

热处理工艺对 7090/SiCp 复合材料组织和性能的影响
Abstract
7090Al/posites were prepared by spray co-deposition processing
with moving hot extrusion,solution and aging , the structure and
properties posite material were studied, the main findings are as
follows:
(1) High Zn content 7090/posite materials were prepared by
co-deposition, the features posite materials have small
grain,symmetrical,small segregation and high density structure.
(2) The microstructure of the deposited and posite materials
were studied,the results shows that the posite material have a lot
of the second phase particles,mainly CuA12 orA12CuMg and small amount of
Fe pounds and single-Si phase, These particle phases are
saturated precipitation.
(3) DSC analysis results showed that the posite form
supersaturated solid solution when it solute at above ℃,these provide a
theoretical basis for rule of solution.
(4) Compared with the microstructure of the single solution and the
double solution and the mechanical property of the two solution,the results
show that 7090/posite get the top aging when posite have
dealed with 450℃℃/3h+500 /3h +120 ℃/18h,and posite mechanical
property increase pared the extruded, the ultimate tensile
strength of posite can reach over 750Mpa,elongation at about 2%.
(5) Observing and analyzing of TEM show that 7090/SiCp precipitate
and η′phase with single aging, intensified effect is in best condition.
the strength decrease obviously with double aging because precipitated phases
e coarse and precipitate η phase when temperature increase.

Key words: Spray co-deposition; 7090/posite; solution; aging;
mechanical property
III
湖南大学
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