Abstract
The primary α–Al grain size was 540±110μm in the Al9Si0.45Mg0.4Cu alloy refined by conventional Al5Ti1B master alloy, and that was 340±80μm in the Al3Ti3B refined alloy. The yield strength, tensile strength and elongation of the T6 heat–treated alloy refined by Al3Ti3B were 320±2MPa, 375±10MPa and 6.0±1.0% respectively, which were increased by 3%, 4% and 50% in comparison with the alloy refined by Al5Ti1B. β”, Q' and θ' precipitates were verified for peak strengthening of the heat–treated alloys. The majority of precipitates were β” and Q’, while the minority was θ'. The volume of porosity was decreased by 50% in the Al3Ti3B refined alloy comparing with the Al5Ti1B refined alloy. The inoculation of AlB2 along with TiB2 results in the better grain refinement under Al3Ti3B, which contributes to the enhancement of yield strength and reduction of porosity. The improvement of tensile strength and ductility in Al3Ti3B refined alloy is attributed to the decrease of the size and area fraction of porosity on the fracture surface.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
