Quinary Alloy

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Sheng Lan - One of the best experts on this subject based on the ideXlab platform.

Hongdu Liu - One of the best experts on this subject based on the ideXlab platform.

Hong‐du Liu - One of the best experts on this subject based on the ideXlab platform.

Simon P. Ringer - One of the best experts on this subject based on the ideXlab platform.

  • Precipitation processes in an Al-2.5Cu-1.5Mg (wt. %) Alloy microAlloyed with Ag and Si
    Acta Materialia, 2003
    Co-Authors: Krishnamurthy Raviprasad, Christropher R Hutchinson, Toshio Sakurai, Simon P. Ringer
    Abstract:

    Abstract We have produced precipitation on and along both the α and the {111}α crystal systems by microAlloying an Al-2.5Cu-1.5Mg (wt. %) base Alloy with Ag and Si. Using electron microscopy and atom probe field ion microscopy, we have demonstrated that Ag+Si additions produce multi-component clustering reactions. When compared to comparable quaternary compositions, the Quinary Alloy exhibits a higher hardness. The first precipitates observed were GPB zones, rich in Cu and Mg and containing traces of both Si and Ag. Following ageing at 200 °C, the peak hardness microstructure consisted of rod-shaped GPB zones along α together with X′ and Ω precipitation, both as plates on the {111}α planes. The Ω phase was less stable than the X′ phase and dissolved soon after ageing to peak hardness. This was associated with a rapid drop in hardness. The overaged microstructure was dominated by S phase.

  • Effects of microAlloying with Cd and Ag on the precipitation process of Al–4Cu–0.3Mg (wt%) Alloy at 200°C
    Micron, 2001
    Co-Authors: Bondon Sofyan, Krishnamurthy Raviprasad, Simon P. Ringer
    Abstract:

    Abstract The present work investigates the effects of individual and combined additions of Cd and Ag on precipitation processes in an Al–4Cu–0.3Mg (wt%) Alloy. Analytical scanning transmission electron microscopy revealed that microAlloying with Cd stimulates nucleation of θ′ phase on {001} α planes and that Cd-rich particles form on the rim and broad facets of the θ′ platelets. We interpret these observations to suggest that Cd nucleates heterogeneously at the θ′–α interface and that θ′ can also nucleate heterogeneously at the Cd–α interface. In the Quinary Alloy, it was observed that Ag and Cd additions seem to work independently resulting in a fine and uniform dispersion of both Ω and θ′. Furthermore, the hardening effect of the {111} α Ω phase appears to be more potent than other precipitates formed in this system since the hardness of the Quinary Alloy was intermediate between the Al–Cu–Mg–Ag and the Al–Cu–Cd Alloys.

Peter K. Liaw - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical behaviors and precipitation transformation of the lightweight high-Zn-content Al–Zn–Li–Mg–Cu Alloy
    Materials Science and Engineering: A, 2021
    Co-Authors: Zheng Ren, Peter K. Liaw, Jingli Ren, Yong Zhang
    Abstract:

    Abstract Designing high-performance Al-based Alloys based on the entropy concept offers a promising strategy for next-generation advanced structural materials. The main idea of entropy increasing is to increase the content of Alloying elements. For traditional high-strength Al–Zn–Mg–Cu Alloy, however, significantly increasing the content of Alloying elements, especially when the Zn content is increased to above 10 at.% (atomic percent), leads to poor deformability and poor tensile property. Here, we overcome this trend by designing a Quinary Alloy based on the idea of high-entropy Alloys. We fabricate a high-Zn-content Al80Zn14Li2Mg2Cu2 Alloy with the Zn content above 10 at.%. It shows Zn, and Al–Zn precipitates in the as-cast state, and it is observed that Al3(Li, Mg), MgZn2, and Zn nano-precipitates form after rolling. The precipitation transformation contributes to high strength and high deformability. Our present findings provide not only a fundamental understanding of precipitation transformation in the high-Zn-content Al Alloys but valuable guidance for the development of lightweight Alloys as well.

  • Microstructures and Stability Origins of β-(Ti,Zr)-(Mo,Sn)-Nb Alloys with Low Young’s Modulus
    Metallurgical and Materials Transactions A, 2015
    Co-Authors: Qing Wang, Ruiqian Zhang, Xiaoxia Gao, Chuang Dong, Peter K. Liaw
    Abstract:

    The present work investigates the microstructural evolution and β-phase stability of a multi-component [(Mo,Sn)-(Ti,Zr)14]-Nb Alloy series developed using the cluster-plus-glue-atom model. Low Young’s modulus (E) can be reached, when both low-E elements, Sn and Zr, and β-Ti stabilizers, Mo and Nb, are properly incorporated in the so-called cluster formulas. After the X-ray diffraction and transmission electron microscopy analysis, and in combination with the β-Ti stability measured by the Mo equivalent, the Young’s modulus of β-Ti Alloys is found to increase with increasing β stabilities and is closely related to both the microstructures of the β matrix and the precipitated phases. More importantly, the morphologies of the β matrix change with β stabilities apparently so that high-E (E >70 GPa) and low-E (E ≤70 GPa) β-Ti Alloys can be distinguished with the microstructures of the β matrix. The Quinary Alloy, formulated as [(Mo0.5Sn0.5)-(Ti13Zr1)]Nb1, owns its lowest E of 48 GPa among the present Alloy series to the mixed thin-lamellar and rod-shaped morphology of the β structure with the lowest stability for the β formation.

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