Pre-ageing of AlSiCuMg alloys in relation to structure and mechanical properties

✍ Scribed by W Reif; S Yu; J Dutkiewicz; R Ciach; J Król

• Publisher: Elsevier Science
• Year: 1997
• Weight: 306 KB
• Volume: 18
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/s0261-3069(97)00060-5

✦ Synopsis

The effect of magnesium addition to the AlSi9Cu3.5 alloy on the hardening and precipitates mor-( ) phology during ageing at RT, 160ЊC or two stage ageing TSA was studied using TEM and XSAS methods. It was found that only alloys with Mg addition harden during RT ageing and they also attain ( the highest hardness maximum at 160ЊC or during TSA. Two types of precipitates starting from 0.4 ) and 1.2 nm were identified during ageing at RT using XSAS method. They cause streaks in the electron diffraction patterns. In alloys aged at 160ЊC with Mg addition the SЈ phase was identified using lattice imaging technique in addition to the Ј plates formed during ageing of the ternary AlSiCu alloy.