Correlation among Composition, Microstructure and Hardness of 7xxx Aluminum Alloy Using Original Statistical Spatial-Mapping Method

Abstract

The quantitative study of the relationship between material composition, microstructure and properties is of great importance for the improvement in material properties. In this study, the continuous data of elemental composition, recrystallization, hardness and undissolved phase distribution of the same sample in the range of 60 to 150 square millimeters were obtained by high-throughput testing instrument. The distribution characteristics and rules of a single data set were analyzed. In addition, each data set was divided into micro-areas according to the corresponding relationship of location, and the mapping between multi-source heterogeneous micro-area data sets was established to analyze and quantify the correlation between material composition, structure and hardness. The conclusions are as follows: (1) the average size of the insoluble phase in the middle of the two materials is larger than that of the surface, but due to the existence of central segregation, the average area of the T4 insoluble phase showed an abnormal decrease; (2) there was positive micro-segregation of Al, Cr, Ti, and Zr elements, and negative micro-segregation of Zn, Cu, and Fe elements in the recrystallized grains of the T5 middle segregation zone; (3) the growth process of the insoluble phase was synchronous with the recrystallization proportion and the size of the recrystallized grains; (4) the composition segregation and recrystallized coarse grains were the main reasons for the formation of low hardness zone in T4 and T5 materials, respectively.

A Quantitative Method for the Composition of 7B05 Cast-Rolled Aluminum Alloys Based on Micro-Beam X-ray Fluorescence Spectroscopy and Its Application in Element Segregation of Recrystallization

“…The gray-black region has fine grains and is composed of deformed sub-grains. Due to crystal defects and dislocation density, a large number of sub-grain boundaries are formed, which are easily corroded, so that the structure appears black [ 3 ]. According to the above research results, Figure 11 is divided into two categories to calculate the element content of recrystallization and deformation microstructures.…”

“…Aluminum alloys are widely used in high-speed train components such as traction beams, corbel beams and buffer beams due to their characteristics of low density, corrosion resistance, weldability and thermal deformation [ 1 , 2 ]. There are obvious differences in the mechanical properties of hot-rolled thick plates of the 7B05 aluminum alloy along the thickness direction [ 3 ]. This anisotropy mainly results from the deformation and uneven temperature distribution during material processing and heat treatment [ 4 ].…”

Quantitative Characterization of Elemental Segregation in Inconel 718 Superalloy by Micro-Beam X-ray Fluorescence Spectroscopy and Its Correlation Study

“…For example, µ-XRF is used to characterize the distribution of sulfur in stalagmite samples [35]. In terms of alloys, µ-XRF has been used to determine the elemental distributions of T4-15 aluminum alloy, and segregation zones of Al, Cr, and Zr in the central layer have been identified [36]. However, µ-XRF has not yet been established as a mature method for quantitative characterization of element segregation in superalloys owing to the matrix effect caused by complex elements.…”

Influence of Anodizing Parameters on Tribological Properties and Wettability of Al2O3 Layers Produced on the EN AW-5251 Aluminum Alloy

“…Aluminum alloys with a high magnesium content and small admixtures of other elements (5xxx series) are very well suited for anodizing. They are characterized by high plasticity and corrosion resistance [ 4 , 5 , 6 , 7 ].…”