The effect of copper addition on the structure and strength of an Al–Li alloy

✍ Scribed by O Kabisch; W Gille; J Król

• Publisher: Elsevier Science
• Year: 1997
• Weight: 165 KB
• Volume: 18
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/s0261-3069(97)00080-0

✦ Synopsis

In this study the effect of copper addition on the structure, precipitation kinetics and hardness in the Al᎐Li and Al᎐Li᎐Cu alloys aged at 200ЊC was investigated. The structures of precipitates were studied ( ) ( ) using X-ray-small-angle-scattering XSAS and transmission electron microscopy TEM methods. The ( ) changes in the structure parameter Rg of both alloys was calculated using two methods, the Guinier ( ) ( ) approximation and correlation function ␥ r . By use of a plot of r ␥ r the distribution law of the T disc 1 thickness was obtained and the coexisting spherical particles of ␦ Ј were estimated. Two types of ␦ Ј precipitates of approximately 2 nm size and above 8 nm and the T precipitates of thickness between 1 3 and 4 nm were observed.