منابع مشابه
Embrittlement of Al-Li-Cu-Mg alloys at slightly elevated temperatures: microstructural mechanisms of hardening
When underaged, damage tolerant Al-Li based alloys are exposed to slightly elevated temperatures (60 to 100oC), their strength increases and toughness decreases. To study the first stages of this process, 8090 sheet in three underaged heat treatment conditions, including T3, T81 and a multistage temper, was exposed for 1000 h at 70°C. Using a model for strengthening in combination with a quanti...
متن کاملZener Relaxation in Al-Li Binary Alloys
Internal friction (I.F.) and modulus measurements have been carried out as a function of temperature in order to study the Li mobility in an A1 8.1 at% Li 0.03 at% Zr alloy. The results show that the sequence of 6' and 6 precipitation can be followed through the evolution of the internal friction spectra. Two peaks appear in the internal friction spectrum. The low temperature peak Pz (450 K), h...
متن کاملDECOMPOSITION IN BINARY Al-Li ALLOYS
We have investigated the influence of aging on the morphology and phase composition of annealed Al-Li binary alloys by means of an atom probe with a multi-detection system. The influence of artifacts such as the preferential evaporation of the Li-atoms and the pile-up effects for the Al-atoms were analysed as well. Specimens of Al 2.0 wt%Li andAl -2.9 wt%Li were solution treated and aged at 190...
متن کاملCASTABILITY OF Al-Li-Mg AND Al-Li-Cu-Mg ALLOYS
The objective of the present work is to study the casting characteristics of various A1-Li alloys, which include fluidity and strengths of the alloys and their interaction with cast molds. Materials investigated are Al-Li-Mg and Al-Li-Cu-Mg alloys with Li content of 2.5 wt%. The results show that sand molds with resin binders are good for A1-Li casting. Ceramic coatings can further reduce the m...
متن کاملAN ATOM-PROBE ANALYSIS OF Al-Li ALLOYS
The aging process in A1-Li alloys was studied by an atom-probe FIM. Two types of precipitates were recognized in the FIM image, one is brightly imaged with a high degree of order in its structure and the other appeared dark against the Al matrix. Atom-probe analysis showed that the Li concentration is in a range of 10 to 25 at% in the dark precipitate and approximately 25 at% in the bright prec...
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ژورنال
عنوان ژورنال: Journal of Japan Institute of Light Metals
سال: 1990
ISSN: 0451-5994
DOI: 10.2464/jilm.40.911