New Controlling Strategy on Grain Refinement Technique and Behavior of High Strength Aluminum Alloy Containing Zr
7050 alloy has been widely used in aerospace and transportation fields due to the excellent mechanical prop-erties.However,the high alloying degree and wide crystallization temperature range lead to the poor castability.More-over,the Zr-poisoning phenomenon easily occurs when the conventional grain refiners are applied,such as Al-Ti-B and Al-Ti-C master alloys.A novel Al-TCB refiner was introduced into 7050 alloy,which was rich in micro-and nano-scale doped particles,and effects on the solidification microstructure,castability and tensile properties of 7050 alloy were investigated.The results indicate that α-Al grains are refined significantly after Al-TCB seed alloy addition,and the fluidity is improved along with reduction of hot cracking tendency.The fact that key point of inhibiting casting defects and improving strength and toughness for 7050 alloy is efficient grain refinement was presented.A new control-ling strategy on grain refinement technique and property of high strength aluminum alloy containing Zr was proposed.
Al-TCB Seed Alloy7050 AlloyGrain RefinementCastabilityStrengthening and Toughening
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