Metastable theta'-Al2Cu precipitates enhance mechanical properties of Al alloy, but gradually transform to theta phase due to diffusion related coarsening at higher temperatures ( > 200 degrees C). To improve understanding of the phase instability and transformation of theta'-Al2Cu, we investigated ...
Evaluation of the Growth Kinetics of theta ' and theta-Al2Cu Precipitates in a Binary Al-3.5 Wt Pct Cu Alloy The Kissinger methodology was applied along with the Lee-Kim-Starink-Zahra kinetic equation to determine the kinetic parameters from the DSC runs at constant heating rates, assuming that...
1. and Magee JC\'s electrophysiology experiments,a biology plausible spiking neuron model for theta phase precession was proposed. θ相移是在大鼠海马中发现的位置细胞放电的特殊模式。更多例句>> 2) θ particles θ相 1. θ(Al2Cu) micro-particle which strengthen base metal separated out and ...
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Growth rate of the theta'-Al_2Cu phase is much larger than that of the Al_3Sc phase at 623K. As the theta'-Al_2Cu precipitates grow in the early stage of the aging, the theta'-Al_2Cu/matrix interface changes from of coherent to semi-coherent nature, until the interface dislocations ...
The theta'-Al2Cu phase in an Al-4Zn-2Cu-1Mg-0.7Si (wt.%) alloy was investigated by means of scanning transmission electron microscopy. With our specific alloy composition, the phase is often formed with stacking faults on {101}(theta') and {001}(theta') planes. The stacking faults on...
theta ' (Al2Cu)Precipitation kineticsIsothermal agingAl-Cu-based alloysUnderstanding the morphological evolution of precipitates is critical for evaluating their hardening effects and therefore improving the yield strength of an alloy during aging. Here we present a three-dimensional phase-field model for...
Al_3Sctheta'-Al_2CuAn Al-2.5 mass percent Cu-0.23 mass percent Sc alloy is strengthened by fine and uniform distribution of coherent spherical L1_2-Al_3Sc phase and semicoherent plate-like #theta#'-Al_2Cu phase, which precipitate during aging. These precipitates interact on growth and ...
The Electrochemistry of θ (Αl2Cu), S (Αl2CuMg) and T1 (Αl2CuLi) and Localized Corrosion and Environment Assisted Cracking in High Strength Al Alloys. Material Science Forum. 2000;331-337:1641-1646.BUCHHEIT R G.Electrochemistry of θ (Al2Cu),S (Al2CuMg) and T1 (A12CuLi) an...
Grain boundaries in metals would introduce extra nucleation energy to promote the growth of theta' precipitate during ageing process. The influence of grain boundaries on the distribution behavior of two theta' precipitates variants (010) and (001) were studied in Al-2Cu alloys bicrystals. Ageing ...