The Al−Be (Aluminum-Beryllium) system

Murray, J. L.; Kahan, D. J.

doi:10.1007/bf02880320

Cited by 30 publications

(6 citation statements)

References 7 publications

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“…The T n of the Al in Be-Al alloy is 642 °C measured by DSC, which is close to 644 °C from the Al-Be phase diagram [1,2] . The T n of Al in Be-Al-Ag-Co-Ge alloy in Fig.…”

Section: Differential Scanning Calorimetrysupporting

confidence: 69%

“…It is necessary to decrease the essential brittleness of Be for many structural applications in the aerospace industry [1] . The beryllium-aluminium (Al) alloys take the advantages of the Al phase's ductility and the Be phase's high modulus [2,3] . Commercial Be-Al alloys with the Be content from 5% to 80% are widely fabricated by investment casting [4] .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Ag, Co, and Ge additions on microstructure and mechanical properties of Be-Al alloy fabricated by investment casting

et al. 2022

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The effects of Ag, Co, and Ge additions on microstructure and mechanical properties of alloys fabricated by investment casting were studied. The results reveal that the trace metals 1.5wt.% Ag, 0.7wt.% Co, and 0.8wt.% Ge additions do not change the nucleation temperature of Be phase. However, the nucleation temperature of the Al phase decreases from 642 °C to 630 °C by DSC due to the Ge addition. The strength of the alloys sharply increases due to the dissolution of the Ag and Ge solutes into the Al phase and the Co into the Be phase characterized by SEM and EDS. Obviously, the strength of Be-Al-Ag-Co-Ge alloy is improved by the solution strengthening. Furthermore, a few Ag 3 Al particles contribute to the strength of the Al phase. Be-Fe-Al ternary intermetallic compounds which can effectively reduce the negative effect of an impurity element Fe on the mechanical properties of Be-Al alloys are also found by XRD and EDS.

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“…The T n of the Al in Be-Al alloy is 642 °C measured by DSC, which is close to 644 °C from the Al-Be phase diagram [1,2] . The T n of Al in Be-Al-Ag-Co-Ge alloy in Fig.…”

Section: Differential Scanning Calorimetrysupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Effects of Ag, Co, and Ge additions on microstructure and mechanical properties of Be-Al alloy fabricated by investment casting

et al. 2022

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“…The Be-AlSi system is characterized by the immiscibility of its primary constituents (Table 3) [24][25][26][27][28][29][30][31][32][33][34][35]. In order to replicate the behavior of the Be-AlSi system, it is necessary that our system also be characterized by base-filler immiscibility.…”

Section: Filler Surrogacymentioning

confidence: 99%

Braze welding of cobalt with a silver–copper filler

Criss

Meyers

2015

Journal of Materials Research and Technology

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j m a t e r r e s t e c h n o l . 2 0 1 5;4(1):44-59 w w w . j m r t . c o m . b r Beryllium surrogacy Welding surrogacy Tungsten inert gas welding a b s t r a c tA new method of joining cobalt by braze-welding it with a silver-copper filler was developed in order to better understand the residual stresses in beryllium-aluminum/silicon weldments which are problematic to investigate because of the high toxicity of Be. The base and filler metals of this new welding system were selected to replicate the physical properties, crystal structures, and chemical behavior of the Be-AlSi welds. Welding parameters of this surrogate Co-AgCu system were determined by experimentation combining 4-point bending tests and microscopy. Final welds are 5 pass manual TIG (tungsten inert gas), with He top gas and Ar back gas. Control of the welding process produces welds with full penetration melting of the cobalt base. Microscopy indicates that cracking is minimal, and not through thickness, whereas 4-point bending shows failure is not by base-filler delamination. These welds improve upon the original Be-AlSi welds, which do not possess full penetration, and have considerable porosity. We propose that utilization of our welding methods will increase the strength of the Be-AlSi weldments. The specialized welding techniques developed for this study may be applicable not only for the parent Be-AlSi welds, but to braze welds and welds utilizing brittle materials in general. This concept of surrogacy may prove useful in the study of many different types of exotic welds.

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“…For the purpose of the calculations, the V and Be contents in the supersaturated Al(α), solution, will be taken as the maximum solubilities for the ternary Al-V and Al-Be phase diagrams at 590 °C, i.e. 0.1 at% V [40] and 0.1 at% Be [41], respectively. The solvus temperature for 8090 alloy can be estimated by using the experimental temperature-composition formula provided by Dorward [42] ‫‪ሻ‬ݏݑݒ݈ݏ‪ܶሺ‬‬ ൌ 284 57.0ሺ%‫݅ܮ‬ሻ 34.6ሺ%‫ݑܥ‬ሻ 36.5ሺ%‫݃ܯ‬ሻ…”

Section: Calculation Of Nucleation Entropymentioning

confidence: 99%

Material design and development: From classical thermodynamics to CALPHAD and ICME approaches

Luo

2015

Calphad

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This paper presents an overview and examples of material design and development using 1) classical thermodynamics; 2) CALPHAD (CALculation of PHAse Diagrams) modeling; and 3) Integrated Computational Materials Engineering (ICME) approaches. Although the examples are given in lightweight aluminum and magnesium alloys for structural applications, the fundamental methodology and modeling principles are applicable to all materials and engineering applications. The examples in this paper have demonstrated the effectiveness and limitations of classical thermodynamics in solving specific problems (such as nucleation during solidification and solid-state precipitation in aluminum alloys). Computational thermodynamics and CALPHAD modeling, when combined with critical experimental validation, have been used to guide the selection and design of new magnesium alloys for elevated-temperature applications. The future of material design and development will be based on a holistic ICME approach. However, key challenges exist in many aspects of ICME framework, such as the lack of diffusion/mobility databases for many materials systems, limitation of current microstructural modeling capability and integration tools for simulation codes of different length scales.

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The Al−Be (Aluminum-Beryllium) system

Cited by 30 publications

References 7 publications

Effects of Ag, Co, and Ge additions on microstructure and mechanical properties of Be-Al alloy fabricated by investment casting

Effects of Ag, Co, and Ge additions on microstructure and mechanical properties of Be-Al alloy fabricated by investment casting

Braze welding of cobalt with a silver–copper filler

Material design and development: From classical thermodynamics to CALPHAD and ICME approaches

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