ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
An Al-3.43Cu-1.28Li-0.49Mg-0.12Zr containing 0.62Zn and 0.29Mn was designed andthe microstructures and mechanical properties of the alloy with various heat treatments wereinvestigated. The precipitates of the alloy consist of T1 (Al2CuLi), θ′ (Al2Cu)[removed info]σ (Al5Cu6Mg2) and δ′(Al3Li). As solution temperature is changed from 485°C to 530°C, the solution degree of alloyingelements in alloy increased, the amount of T1 in the alloy aged at 160°C for 18 h increased and that ofθ′ is decreased, resulting in an increase of strength. After solution treatment at 530°C, the alloy agedfor 18 h at 145°C is mainly strengthened by G P zones, and a little amount of T1 precipitates. As agingtemperature is increased to 160°C and 175°C, the strength increased, due to the sufficientprecipitation of σ and T1. The smaller amount of T1 in the alloy aged at 190°C is consistent with itslower strength. Meanwhile, it is found that the σ precipitate does not coarsen as aging temperatureincreases in the range from 160°C to 190°C
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.995.pdf
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