The variation of tensile characteristics of Al–2 wt.%Ag and Al–2 wt.%Ag–1 wt.%Sn alloys during transformation

✍ Scribed by R.H. Nada

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 373 KB
• Volume: 528
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2010.10.010

✦ Synopsis

Effect of tin addition and heat treatment on the work hardening characteristics of Al-2 wt.%Ag alloy during phase transformation has been studied in the deformation temperature range from 503 K to 583 K. The fracture strain ε f , and dislocation slip distance L increased with increasing deformation temperature. On the other hand the coefficient of work hardening = ı 2 /ıε, the fracture time t f , yield stress, y fracture stress, f decreased with increasing deformation temperature and exhibited an abrupt increase at about 553 K. The Sn-free samples were generally harder than the ternary alloy. The activation energy of the fracture mechanism in both alloys was around 26.8 ± 3 kJ/mol and 34.6 ± 3 kJ/mol before and after transformation temperature (553 K), respectively. The quenched samples are harder than those of slowly cooled samples. From X-ray analyses it is clear that when lattice strain ε and dislocation density increases, the crystallite size Á decreases.