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原文传递 Dynamic Failure Mitigation Through Microstructure Control: Application to Aluminum and Magnesium Alloys.

题名：	Dynamic Failure Mitigation Through Microstructure Control: Application to Aluminum and Magnesium Alloys.
作者：	Agnew, S. R.; El Kadiri, H.
关键词：	Aluminum alloys, Magnesium alloys, Microstructure, Failure (mechanics), Strength (mechanics), Heat treatment, Aging (materials), Anisotropy, Strain rate, Interactions, Transmission electron microscopy, Materials engineering, Flow, Predictions, Texture, Orientation (direction), Asymmetry, Precipitates, Crystal twinning, Models, Constitutive properties, Grain structures (metallurgy), Dynamic failure mitigation, Microstructure control, Aa6055, Aa7085, We43, Plastic anisotropy, Epsc (elastoplastic self-consistent), Epsc polycrystalline deformation model, Precipitate-grain-polycrystal interactions, Tem (transmission electron microscopy), Icme (integrated computational materials engineering), Precipitate shearability, Preferred orientation, Orowan strengthening, Non-basal slip
摘要：	The overall goal of the project was to determine the microstructure design principles necessary to optimize the mechanical behavior of precipitation strengthened Al and Mg alloys. We have selected three alloys (AA6055, AA7085, and Mg alloy, WE43) together with industrial partners, ALCOA (now Arconic) and Magnesium Elektron N.A., who have provided the material in their optimized tempers for armor applications. We also heat treated alloys AA7085 and WE43 to examine them in solution heat treated (T3), under-aged, and peak-aged (T6) conditions. WE43 was also examined in the solution heat treated, stretched, and peak-aged (T8) condition. Previous interim reports emphasized constitutive data obtained at quasi-static and dynamic strain rates, as well as microstructure data, including electron backscattered diffraction (EBSD) data obtained from as-received and deformed samples. This final report summarizes our major findings and achievements, with an emphasis on the past two years of the project. Accomplishments: In the past two years, we have made five noteworthy achievements described briefly below, which are also described with graphics in the attached 2 power point slides. All the published references are provided in the 'Dissemination' section. The papers that are in review are attached. 1. We have demonstrated that a new high strength Al alloy (AA7085 in T711 and T721 tempers) that has recently been contemplated as a candidate lightweight metallic armor plate material by the Army exhibits a lower level of plastic anisotropy at quasi-static and dynamic strain rates than one would expect, given the significant crystallographic texture observed in the plate material. This is good news for design engineers, since a highly anisotropic response would greatly complicate the design process. This result has been presented at international conferences and a paper is published in International Journal of Plasticity (see ref. [4] in 'Dissemination').
报告类型：	科技报告