Grain refinement of 7075Al alloy microstructures by inoculation with Al-Ti-B master alloy

Innovative Ideas in Science 2016

Hotea, V.^1 ; Juhasz, J.^1 ; Cadar, F.^2

Technical University of Cluj-Napoca, North University Center of Baia Mare, Faculty of Engineering, Department of Mineral Resources Engineering, Materials and Environment, dr.V. Babes str., no. 62A, Baia Mare

430083, Romania^1

Universal Alloy Corporation Europe SRL, Dumbravita, Romania^2

关键词: 7075 Al alloy;    Al -Zn-Mg-Cu alloys;    Al-ti-b master alloys;    Alloy microstructure;    Columnar structures;    Eutectic structures;    Intermetallic phasis;    Melt treatments;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/200/1/012029/pdf
DOI  :  10.1088/1757-899X/200/1/012029

来源: IOP

【 摘 要 】

This paper aims to bring some clarification on grain refinement and modification of high strength alloys used in aerospace technique. In this work it was taken into account 7075 Al alloy, and the melt treatment was carried out by placing in the form of master alloy wire ternary AlTiB the casting trough at 730°C. The morphology of the resulting microstructures was characterized by optical microscopy. Micrographs unfinished and finished with pre-alloy containing ternary Al5Ti1B evidence fine crystals, crystal containing no columnar structure and highlights the size of the dendrites, and intermetallic phases occurring at grain boundaries in Al-Zn-Mg-Cu alloy. It has been found that these intermetallic compounds are MgZn2type. AlTiB master alloys finishing ensures a fine eutectic structure, which determines the properties of hardware and improving the mechanical properties of aluminum alloys used in aeronautical engineering.