Student News

13th International Conference on Aluminium Alloys

Application of Computational Thermodynamics and Precipitation Kinetics to Light Weight Al Alloy Design

Authors:

Student: Danielle Belsito
Advisors: Prof. Richard D. Sisson

Abstract: The U.S. Military requires structural materials that offer significant weight reduction with improved performance, multi-functionality, durability, and cost reduction to enhance the lethality and survivability of the individual Soldier and advanced weapon systems. To meet that need, new high strength, high toughness, light weight alloys are being developed. The primary focus of this effort is to develop an aluminum alloy powder that can be consolidated by the cold spray process, as well as by more conventional means. This will be accomplished through discovering primary process conditions and environment windows to establish the optimum multiscale chemistries and microstructures of the material before thermomechanical processing. Secondary thermomechanical process parameters will also be manipulated in order to maximize the aluminum-based heterogeneous material. Initial efforts involve the development of multi-component phase diagrams, isotherms, and isopleths using thermodynamic and kinetic software, Thermo-Calc, Pandit and TC-PRISMA®, to predict the microstructure and performance of these alloys.

Reuse of Al Dross as an Engineered Product

Authors:

Student: Chen Dai
Advisor: Diran Apelian

Abstract: In order to channel Al dross towards an appropriate engineering application, two different types of dross waste were selected from industrial production streams for characterization. Physical and chemical tests indicated that dross waste may be applied directly but better processed with boiled water to reduce crack-causing gases which form during the hydration reaction. Mechanical property evaluations revealed the possibility for dross waste to be utilized as filler in concrete, resulting in 25% higher flexural strength and a 5% higher compressive strength compared to pure cement. In addition, comparisons were carried out between similar size and fraction of dross powder and sand additions to concrete; the results indicate that fine dross powder had a positive effect on mechanical properties of concrete vs. to additions of sand. The opportunities to utilize a waste material as for engineering applications for construction materials will be reviewed and discussed.

June 6, 2012