Vibration behavior of light metals: Al–Zn alloy and Mg–Al–Zn alloy

Hung, Fei-Yi; Lui, Truan-Sheng; Chen, Li Hui; Chang, Han Wen; Chen, Zong Fu

doi:10.1007/s10853-006-0595-5

Cited by 7 publications

(4 citation statements)

References 21 publications

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“…In fact, only dozens of compositions with the conventional metallic elements such as Al, Co, Cu, Cr, Fe, Ni, Nb, W, Ti, V, Mo and Zr were reported hitherto to satisfy the HEA-formation criteria [7,8]. The high entropy effect can significantly reduce the free energy of simple solid-solution phases at high temperature, leading to strong thermal stability on both structure and properties in HEAs [9][10][11][12]. Owing to the same opportunity for each constituent element to occupy the lattice sites, the mismatch of atomic sizes and chemical bonds can lead to a severe distorted lattice structure in HEAs [13,14].…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation study on the creep characteristics of high-entropy alloy films: fcc versus bcc structures

Feng

Debela

et al. 2016

International Journal of Refractory Metals and Hard Materials

100

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Using the magnetron sputtering technique, two typical high-entropy alloy (HEA) films namely CoCrFeNiCu (Al-0) with a face-centered cubic (fcc) structure and CoCrFeNiCuAl 2.5 (Al-2.5) with a body-centered cubic (bcc) structure were prepared by alloy targets. The as-deposited HEA films have a columnar-growth mode and nanocrystalline grains. The creep behaviors of both HEA films were systematically investigated by nanoindentation with a Berkovich indenter. The bcc Al-2.5 exhibited a stronger creep resistance than the fcc Al-0. In addition, with the increase of holding load and/or loading rate, the creep deformation was significantly enhanced in the fcc Al-0. Interestingly, it was almost history-independent in the bcc Al-2.5. The creep characteristics of HEA films could be related to the distinct lattice structures, which apparently affect the kinetics of plastic deformation. The strain rate sensitivity (SRS) and activation volume of the dislocation nucleation were carefully estimated for both HEA films. In view of the large differences of activation volumes between Al-0 and Al-2.5, we present discussions to explain the observed creep characteristics in HEA films.

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Section: Introductionmentioning

confidence: 99%

Nanoindentation study on the creep characteristics of high-entropy alloy films: fcc versus bcc structures

Feng

Debela

et al. 2016

International Journal of Refractory Metals and Hard Materials

100

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“…Figure 7 shows the D-N curves of the specimens under resonant frequency and a constant initial deflection amplitude. [15][16][17]20,21) The D-N curve can be divided into an initial stage with ascending deflection amplitude, a second stage in which deflection remains constant, and a final stage with a descending deflection amplitude. The ascending and constant deflection amplitudes within Stage I and Stage II can be attributed to the effect of strain hardening in competition with crack generation and linking within this region.…”

Section: Resultsmentioning

confidence: 99%

Mechanical Properties and Resonant Characteristics of Friction Stirred AZ31-Mg Alloy

et al. 2008

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An annealed AZ31-Mg specimen (AZ31-O) was given a FSP (friction stir process) to obtain a AZ31-FSP specimen, whose tensile and vibration fracture mechanisms are examined in this study. As a result of FSP, the structure of the stirred zone (SZ) separated into two zones: (1) the SZ-top had a finer structure and (2) the grain size of the SZ-bottom was like the AZ31-O specimen. Because the basal plane (0002) had pressed close to the trace surface of the onion structure in the SZ, the recrystallization of FSP increased the elongation of the specimens at room temperature, but the refined grains had no contribution to tensile strength and had an unusual Hall-Petch effect. Notably, the vibration deformed resistance of the AZ31-FSP specimen was higher than that of the AZ31-O specimen. The FSP specimen not only possessed finer structures but also had a preferred orientation in the stirred zone. This led to an increase in the crack tortuosity, which in turn increased the crack propagation resistance and the vibration life.

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“…The high-zinc Al-Zn alloys with addition of various alloying components surpass other aluminium alloys and many casting alloys in general in their damping qualities in comparison to their density. The additional advantages of these materials are their high tribological properties [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Their tendency to form the coarse grain microstructure is particularly easy to observe in castings produced in sand moulds, but occurs also in those cast in metal dies. Therefore the Al-Zn alloys are frequently inoculated [15,16]. Al-Ti, Al-Ti-B, or Al-Ti-C master alloys are used for refining of the structure.…”

Section: Introductionmentioning

confidence: 99%

The Assessment of Modification of High-Zinc Aluminium Alloy

Zyska¹,

Konopka²,

Łągiewka³

et al. 2014

Archives of Foundry Engineering

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The results of examinations of the influence of titanium-boron inoculant on the solidification, the microstructure, and the mechanical properties of AlZn20 alloy are presented. The examinations were carried out for specimens cast both of the non-modified and the inoculated alloy. There were assessed changes in the alloy overcooling during the first stage of solidification due to the nuclei-forming influence of the inoculant. The results of quantitative metallographic measurements concerning the refinement of the grain structure of casting produced in sand moulds are presented. The cooling rate sensitivity of the alloy was proved by revealing changes in morphology of the α-phase primary crystals. Differences in mechanical properties resulting from the applied casting method and optional inoculation were evaluated.

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Vibration behavior of light metals: Al–Zn alloy and Mg–Al–Zn alloy

Cited by 7 publications

References 21 publications

Nanoindentation study on the creep characteristics of high-entropy alloy films: fcc versus bcc structures

Nanoindentation study on the creep characteristics of high-entropy alloy films: fcc versus bcc structures

Mechanical Properties and Resonant Characteristics of Friction Stirred AZ31-Mg Alloy

The Assessment of Modification of High-Zinc Aluminium Alloy

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