Characterization of Precipitation in 7055 Aluminum Alloy by Laser Ultrasonics

Zhu, Zhiwei; Peng, Hao; Xu, Yacheng; Song, Xueyong; Zuo, Jinrong; Wang, Ying; Shu, Xuedao; Yin, Anmin

doi:10.3390/met11020275

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…The SEM images obtained from the fracture zone of the stainless steel samples showed a predominantly brittle fracture, as can be seen in Figure 9 c,d, with more cracking zones and pores than the aluminum sample. Similar data were reported in [ 38 , 39 , 40 , 41 , 42 , 43 ]. In the case of the stainless steel samples, it was observed that the fracture angle between the applied traction load axis and the fracture surface was almost perpendicular and showed a relatively flat fracture surface, as seen in Figure 9 b.…”

Section: Resultssupporting

confidence: 90%

Mechanical and Acoustic Properties of Alloys Used for Musical Instruments

et al. 2022

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Music should be integrated into our daily activities due to its great effects on human holistic health, through its characteristics of melody, rhythm and harmony. Music orchestras use different instruments, with strings, bow, percussion, wind, keyboards, etc. Musical triangles, although not so well known by the general public, are appreciated for their crystalline and percussive sound. Even if it is a seemingly simple instrument being made of a bent metal bar, the problem of the dynamics of the musical triangle is complex. The novelty of the paper consists in the ways of investigating the elastic and dynamic properties of the two types of materials used for musical triangles. Thus, to determine the mechanical properties, samples of material from the two types of triangles were obtained and tested by the tensile test. The validation of the results was carried out by means of another method, based on the modal analysis of a ternary system; by applying the intrinsic transfer matrix, the difference between the obtained values was less than 5%. As the two materials behaved differently at rupture, one having a ductile character and the other brittle, the morphology of the fracture surface and the elementary chemical composition were investigated by scanning electron microscopy (SEM) and analysis by X-ray spectroscopy with dispersion energy (EDX). The results were further transferred to the finite element modal analysis in order to obtain the frequency spectrum and vibration modes of the musical triangles. The modal analysis indicated that the first eigenfrequency differs by about 5.17% from one material to another. The first mode of vibration takes place in the plane of the triangle (transverse mode), at a frequency of 156 Hz and the second mode at 162 Hz, which occurs due to vibrations of the free sides of the triangle outside the plane, called the torsion mode. The highest dominant frequency of 1876 Hz and the sound speed of 5089 m/s were recorded for the aluminum sample with the ductile fracture in comparison with the dominant frequency of 1637 Hz and the sound speed of 4889 m/s in the case of the stainless steel sample, characterized by brittle fracture.

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Section: Resultssupporting

confidence: 90%

Mechanical and Acoustic Properties of Alloys Used for Musical Instruments

et al. 2022

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“…Movahedirad et al [22] studied the influence of the ultrasonic vibration input containing the parabolic logarithm term on the flow field and obtained a more realistic flow field state. Combining with the relevant ultrasonic decay formula and the magnitude of the coefficient [28] , [29] , it is assumed that the upper boundary ultrasonic input is exponential decay symmetrical along the center, and the boundary condition is:

…”

Section: Numerical Methods and Proceduresmentioning

confidence: 99%

Evolution behavior of cavitation bubble in pure Sn liquid medium with narrow gap under low-amplitude ultrasound

Li,

Zhao,

et al. 2023

Ultrasonics Sonochemistry

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“…In polycrystalline materials, these occur primarily at grain boundaries. Thus, in metallic materials such as aluminum alloys, conclusions can be drawn about grain size changes due to absorption [17] and precipitation effects due to velocity variation [18].…”

Section: Non-destructive Contact-free Measurement Techniquementioning

confidence: 99%

Development of a novel in-situ measurement method for thermo-mechanically coupled material characterization of high-strength aluminum alloys

Rigas

Garcin²,

Kuball

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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High-strength aluminum alloys are more and more used for safety and crash-relevant components due to their advantageous density-to-strength ratio. By using thermal-supported forming strategies, failure-free deep drawing is possible for these materials. In this context, the hot form quench process (HFQ®) has shown to be a promising thermally-assisted forming strategy. By using locally tempered forming tools, the production of tailored components with different mechanical properties is possible. However, material characterization and process design with conventional characterization methods are quite challenging in this context. A new approach is the use of ultrasound-assisted material characterization in combination with a thermo-mechanical simulator. Thereby it is possible to perform an in-situ material characterization. So far, this technology is mainly used for steel materials. In this contribution, the potential of an adapted measurement strategy for high-strength aluminum alloys is presented. For this purpose, the influence of different measurement parameters on modified samples and the resulting measurement signal is investigated. With the help of this study, new standards are set for time-bound material characterization under thermo-mechanical stress. As a result, thermally-assisted forming methods can be designed more efficiently and faster in the future.

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Characterization of Precipitation in 7055 Aluminum Alloy by Laser Ultrasonics

Cited by 10 publications

References 33 publications

Mechanical and Acoustic Properties of Alloys Used for Musical Instruments

Mechanical and Acoustic Properties of Alloys Used for Musical Instruments

Evolution behavior of cavitation bubble in pure Sn liquid medium with narrow gap under low-amplitude ultrasound

Development of a novel in-situ measurement method for thermo-mechanically coupled material characterization of high-strength aluminum alloys

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