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151.
J. Wadsworth F. H. Froes 《JOM Journal of the Minerals, Metals and Materials Society》1989,41(5):12-19
High-performance aerospace systems are creating a demand for new materials, not only for airframe and engine applications, but for missile and space systems as well. Recently, advances have been made in metallic materials systems based on magnesium, aluminum, titanium and niobium using a variety of processing methods, including ingot casting, powder metallurgy, rapid solidification and composite technology. 相似文献
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153.
L. Lu M. O. Lai F. H. Froes 《JOM Journal of the Minerals, Metals and Materials Society》2002,54(2):62-64
This article reviews the mechanical alloying of titanium aluminides carried out in the past decades. Research has proven that
mechanical alloying is an efficient means to synthesize nano-structured and non-equilibrium titanium aluminides. Although
fine-grained structures have been successfully produced, effort is still needed to reduce contamination and to consolidate
nano-structural powders. 相似文献
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155.
M. Ashraf Imam F. H. Sam Froes 《JOM Journal of the Minerals, Metals and Materials Society》2010,62(5):17-20
There are a number of maturing extraction and fabrication techniques which can potentially reduce the cost of titanium. These
are in part responsible for a number of developing applications for titanium. 相似文献
156.
M. L. Öveçoglu O. N. Senkov F. H. Froes N. Srisukhumbowornchai 《Metallurgical and Materials Transactions A》1999,30(3):751-761
Prealloyed, gas-atomized (GA) Ti-47Al-3Cr alloy powder, containing about 70 pct of the α
2 (Ti3Al) phase and 30 pct of the γ (TiAl) phase, was fully amorphized by mechanical alloying. The amorphous phase was stable during heating to 600 °C, but decomposed
at higher temperatures, with an exothermic reaction peak at 624 °C as the material transformed to a mixture of α
2 and γ and then to a fully γ structure at 722 °C. A nanocrystalline compact with a mean grain size of 42 nm was obtained by hot isostatic pressing (HIP’ing)
of the amorphous powder at 725 °C. Isothermal annealing experiments were conducted in the two-phase α+γ field, at 1200 °C, using holding times of 5, 10, 25, and 35 hours, followed by air cooling. The X-ray diffractometry and
analytical transmission electron microscopy investigations carried out on annealed and air-cooled specimens revealed only
the presence of the γ grains, which coarsened on annealing. Initially, the grains grew, followed by a saturation stage after annealing for 25 hours,
with a saturation grain size of about 1 μm. This grain growth and saturation behavior can be described with a normal grain growth mechanism in which a permanent pinning
force is taken into account. Twins formed in the γ grains as a result of annealing and air cooling and exhibited a common twinning plane of (111) with the matrix phase. The
minimum γ grain size in which twinning occurred in the annealed specimens was determined to be 0.25 μm, which suggests that twinning is energetically unfavorable in the nanometer-sized grains. 相似文献
157.
How to market titanium: Lower the cost 总被引:1,自引:0,他引:1
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