Stabilization Effect of Zr and Ti Additions on the Ageing Characteristics of Al-1 wt% Si Alloy Through a Creep Study

✍ Scribed by Dr. G. H. Deaf; M. H. N. Beshai; A. M. Abd El Khalek; Prof. Dr. G. Graiss; Prof. Dr. M. A. Kenawy

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 446 KB
• Volume: 32
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170320309

✦ Synopsis

Si-0.1 wt% Zr-0.1 wt% Ti alloys were used to trace the effect of Zr and Ti additions on the behaviour of the steady state creep. After solid solution treatment specimens of both alloys were aged at 623, 673, 723 and 773 K and creep tests were performed at room temperature by applying stresses of 60.0, 62.4, 64.7 and 67.1 MPa. The results showed a sound stabilization effect of Zr and Ti on the ageing characterstics of binary Al-1 wt% Si alloy. Values of the applied stress sensitivity parameter, m, obtained were in the range of (20-34) for Al-Si alloy and (14-19) for Al-Si-Zr-Ti alloy. Time to rupture was found to be strongly increased by Zr and Ti additions. The activation energies of the precipitation process involved were found to be 81.9 kJ/mole and 33.7 kJ/mole of the Al-Si and Al-Si-Zr-Ti alloys respectively.