Microstructure and mechanical properties of oxidation resistant suction cast Nb–Si–Al alloy

“…[3][4][5][6] In recent years, the use of alloying and optimizing processing techniques has improved mechanical properties at room temperature. Kashyap et al [7][8][9] studied that the addition of In, Al, and Mg significantly improved the mechanical properties and oxidant properties of Nb-Si alloy. In addition, theoretical studies show the bulk modulus/shear modulus (B/G) ratio of 1.54 [10] of Nb 5 Si 3 alloy, meaning that this alloy is a brittle material.…”

Section: Introductionmentioning

confidence: 99%

Influences of Vacancy Concentration and Al Substitution on Structural, Electronic, and Elastic Properties of Nb₅Si₃ from First‐Principles Calculations

Zeng

Zhu

et al. 2021

Physica Status Solidi (b)

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The effects of vacancy concentration and Al substitution on the structural, electronic, and elastic properties of Nb5Si3 are studied using first‐principles calculations. The formation energy, elastic modulus, and electronic properties of three different Nb vacancies in Nb5Si3 are discussed in detail. With the increase in vacancy concentration, the obtained shear modulus, Young's modulus, and hardness of Nb vacancy decrease, which are lower than those of pristine Nb5Si3. The bulk modulus/shear modulus (B/G) ratio increases with the increase in Nb vacancy concentration. However, these vacancies result in the transition from brittleness to ductility, and Nb5Si3 with 5% vacancy concentration exhibits ductile behavior. The calculation of electronic structure shows that these Nb vacancies change the local hybridization between Nb and Nb atoms. As the concentration increases, the position of the peak moves toward lower energy. It is predicted that vacancies can improve the ductility behavior of Nb5Si3.

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“…Wear resistance of the cast alloy is significantly influenced by the microstructure of the alloy, including the size and shape of Fe-rich intermetallic, coarse eutectic Si phase, and minimal a-Al phase and its secondary dendrite arm spacing (SDAS). 5 In order to improve the wear resistance property of Al-Si alloy, two major approaches have been developed to modify the microstructure of the alloy. One is heat treatment.…”

Section: Introductionmentioning

confidence: 99%

The effect of Sr on the microstructure and wear properties of AlSi5Cu1Mg alloy

Zhu

Luo

et al. 2018

Advances in Mechanical Engineering

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The effect of different amounts (0 wt%, 0.02 wt%, 0.04 wt%, 0.06 wt%) of Sr modification on the microstructure of AlSi5Cu1Mg alloy was investigated. The wear resistances of the alloys were tested using an MMD-1 pin-on-disk weartesting apparatus. Worn surfaces were examined using a scanning electron microscopy equipped with an energydispersive spectrometer. The relationship between the microstructure and wear properties of the alloy was discussed. The results show that the addition of Sr caused the grain refinement and AlSi5Cu1Mg with 0.04 wt% Sr has short rodlike Fe-rich intermetallic, minimal size of a-Al phase and secondary dendrite arm spacing, and granular or fibrous eutectic Si phase distributed uniformly at grain boundaries. Compared to the matrix alloy, the tensile strength, Brinell hardness, and elongation of the AlSi5Cu1Mg with 0.04 wt% Sr increased by 15%, 48%, and 73%, respectively. Both the lowest friction coefficient and the best wear resistance were achieved by the AlSi5Cu1Mg with 0.04 wt% Sr. Compared to the matrix alloy, the wear mass loss and friction coefficient of the AlSi5Cu1Mg with 0.04 wt% Sr increased by 42% and 18%, respectively. The adhesive wear and abrasive wear are the main wear mechanisms.

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Microstructure and mechanical properties of oxidation resistant suction cast Nb–Si–Al alloy

Cited by 55 publications

References 34 publications

Influence of vacancy on structural and elastic properties of NbSi 2 from first-principles calculations

Influence of vacancy on structural and elastic properties of NbSi 2 from first-principles calculations

Influences of Vacancy Concentration and Al Substitution on Structural, Electronic, and Elastic Properties of Nb₅Si₃ from First‐Principles Calculations

The effect of Sr on the microstructure and wear properties of AlSi5Cu1Mg alloy

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Microstructure and mechanical properties of oxidation resistant suction cast Nb–Si–Al alloy

Cited by 55 publications

References 34 publications

Influence of vacancy on structural and elastic properties of NbSi 2 from first-principles calculations

Influence of vacancy on structural and elastic properties of NbSi 2 from first-principles calculations

Influences of Vacancy Concentration and Al Substitution on Structural, Electronic, and Elastic Properties of Nb5Si3 from First‐Principles Calculations

The effect of Sr on the microstructure and wear properties of AlSi5Cu1Mg alloy

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Influences of Vacancy Concentration and Al Substitution on Structural, Electronic, and Elastic Properties of Nb₅Si₃ from First‐Principles Calculations