Correlation of Macro- and Micro- Mechanical Properties of Beryllium Metal AITranslate

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Basic Information:

DOI：10.13373/j.cnki.cjrm.XY25010032

Chinese Library Classification Number:TG146.24

Citation Information:

Beryllium and its alloys，as a rare metal material with superior physical and mechanical properties，have irreplaceable applications in strategic engineering fields such as aviation，aerospace，and nuclear. Because of this，the study of mechanical behavior （properties） related to its service reliability and safety has been an important topic of concern in beryllium science. For a long time，research on the mechanics of beryllium has mainly focused on the macroscopic mechanical behavior （properties） directly related to engineering applications，but little progress has been made in the study of its micromechanical behavior （properties） due to the limitations of research tools. The exploration of cross-scale correlations between the macroscopic and microscopic mechanical properties of beryllium has also been carried out even less. In this paper，the elastic modulus，plastic work ratio （ratio of plastic work to total work），hardness （yield strength） and other mechanical parameters with cross-scale characteristics were token as the objects of investigation，and the nanoindentation test method in the micro-scale and the loading\unloading tensile test method in the macro-scale were adopt to obtain the macroscopic and microscopic information of the above parameters，respectively. The microscopic mechanical property parameter values were obtained from the nanoindentation load-displacement curve （P-h curve） based on Oliver-Pharr model，and the macroscopic mechanical property parameter values were obtained from the continuous loading\unloading curve （stress-strain curve） based on the analysis of stress-strain hysteresis loop characteristics. The results showed that：1） The modulus of elasticity exhibited similar trends on macro and micro scales，decreasing monotonically with deformation and at close numerical levels. The consistency of the evolution curves of the modulus of elasticity at the macro scale for different elongation rates was more significant than the micro scale values. 2） On the microscopic scale，the plastic work W_p of specimens with different macroscopic elongations satisfied the same proportionality relationship between the plastic work W_p and the total work W，W_p=0.8461W，and its residual deformation permanent plastic deformation h_f had a more significant proportionality relationship with the maximum deformation h_max，h_f=0.85h_max；and the relationship between the maximum load P_max and the maximum deformation h_max was not sensitive to the macroscopic elongation either. On the macroscopic scale，the consistency of the mathematical characteristics of the relationship between the plastic work W_p and the total work W of the specimens with different elongations was less than that of the microscopic scale，with W_p/W of about 0.25，which was much smaller than the microscopic value. 3） The grain microhardness H was insensitive to the macroscopic elongation，with a value of about 4.5 GPa，which corresponded to a yield stress value of about 1.5 GPa according to the theory of indentation mechanics，which was much larger than the macroscopic yield stress value of 0.4~0.5 GPa. In addition，the size effect of grain microhardness was also weak，and there was no significant change in H value for different deformations h_max for each specimen. Therefore，for beryllium metal，it could be assumed that grain properties played a major role in determining properties like elastic modulus，while the influence of the plastic properties of the grains themselves was not obvious in the determination of macroscopic plastic mechanical properties such as strength and elongation. In other words，the variability in the mechanical properties of the beryllium grains themselves，as the microscopic units that made up the macroscopic metallic material，was not significant. It had been shown that the cracking and slipping behavior of beryllium grains had the characteristic of being confined within the grains. It could thus be speculated that the factors determining the variability of the macroscopic plastic properties were likely to come more from the grain boundary behavior.