Elastic constants measurements of β Cu-Al-Be alloys

Rı́os-Jara, D.; Belkahla, S.; Canales, Alejandro I.; Flores, Horacio R.; Guénin, G.

doi:10.1016/0956-716x(91)90413-u

Cited by 11 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Microscale heterogeneity is not considered a disadvantage in nanostructured materials formed by SPD [ 3 , 58 , 59 , 60 , 61 ]. In the unmodified material, local hardness variations can be attributed to the elastic [ 62 ] and plastic anisotropy of the austenite grains. In the modified material, this effect is enhanced by the fact that the indentation size is comparable to the size of the microstructural features shown in Figure 4 d. Different behaviour can be expected if the centre of the indent coincides with the centre of an austenite zone or whether it is close to a martensite or grain boundary [ 63 , 64 , 65 ].…”

Section: Discussionmentioning

confidence: 99%

Surface Nanostructuring of a CuAlBe Shape Memory Alloy Produces a 10.3 ± 0.6 GPa Nanohardness Martensite Microstructure

et al. 2020

View full text Add to dashboard Cite

Severe plastic deformation (SPD) has led to the discovery of ever stronger materials, either by bulk modification or by surface deformation under sliding contact. These processes increase the strength of an alloy through the transformation of the deformation substructure into submicrometric grains or twins. Here, surface SPD was induced by plastic deformation under frictional contact with a spherical tool in a hot rolled CuAlBe-shape memory alloy. This created a microstructure consisting of a few course martensite variants and ultrafine intersecting bands of secondary martensite and/or austenite, increasing the nanohardness of hot-rolled material from 2.6 to 10.3 GPa. In as-cast material the increase was from 2.4 to 5 GPa. The friction coefficient and surface damage were significantly higher in the hot rolled condition. Metallographic evidence showed that hot rolling was not followed by recrystallisation. This means that a remaining dislocation substructure can lock the martensite and impedes back-transformation to austenite. In the as-cast material, a very fine but softer austenite microstructure was found. The observed difference in properties provides an opportunity to fine-tune the process either for optimal wear resistance or for maximum surface hardness. The modified hot-rolled material possesses the highest hardness obtained to date in nanostructured non-ferrous alloys.

show abstract

Section: Discussionmentioning

confidence: 99%

Surface Nanostructuring of a CuAlBe Shape Memory Alloy Produces a 10.3 ± 0.6 GPa Nanohardness Martensite Microstructure

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The finite element analysis was realized using ABAQUS software. The linear anisotropic elastic constants for a Cu-Al-Be SMA as published by (Rios-Jara et al, 1991) were used for a cubic symmetry, with C 11 = 141.6 GPa, C 12 = 127.4 GPa, C 44 = 94.2 GPa. The reference systems defined in section 1 were defined in every ABAQUS simulation so that the crystallographic orientation for all elements was defined by the measured Euler angles φ 1 = 181.6, ϕ = 93.9, φ 2 = 345.4.…”

Section: Methodsmentioning

confidence: 99%

Analysis of the Martensite Variant Selection in a Single Crystal Cu-Al-Be Shape Memory Alloy in a Tensile Test

Castillo¹,

Schouwenaars²,

Pérez³

et al. 2022

JER

View full text Add to dashboard Cite

This workanalyses the crystallographic martensite variants (MVs) which are activated in a Cu-Al-Be monocrystal subject to a tensile test. Four variants were observed in-situ and analyzed by means of the Schmid Factor (SF) criterion. A finite element simulation was performed to obtain the stress in the regions where the martensite variants are observed. The results of the simulation are in good agreement with the variants predicted by the SF, with only small deviations from the ideal orientation of the martensite phase. This result provides interesting information to be used in future refinements of the criteria presented in earlier research.

show abstract

“…Para el CuBe se utilizaron los parámetros correspondientes al Cu, obteniendo una pendiente de 0.052 usando la ecuación (6) y 0.047 usando la ecuación (7). Para el CuAlBe se consideró la dependencia lineal con la temperatura dada por Rios Jara et al [16] obtenida mediante mediciones de ultrasonido y de las mismas se calcularon c 11 , c 12 y c 44 a distintas temperaturas. Mediante el modelo de Hill se calculó E a diferentes temperaturas, y en este caso la dependencia con la temperatura de E mostró una pendiente igual a 0.026, bastante inferior a la obtenida experimentalmente.…”

Section: Medición Del Módulo E a Diferentes Temperaturasunclassified

“…En la Figura 6 se presentan los resultados medidos experimentalmente de E, junto con el resultado arrojado por el cálculo según los modelos mencionados. Las constantes elásticas fueron obtenidas de [16] para CuAlBe, [17] para Cu y aluminio, y [18] para CuBe. Para CuBe y CuAlBe se ha representado el valor correspondiente al menor y al mayor tamaño de grano obtenido en este trabajo.…”

unclassified

Medición del módulo de Young en metales mediante la técnica de excitación por impulso

2018

View full text Add to dashboard Cite

RESUMEN La excitación por impulso como técnica no destructiva para el estudio de materiales permite determinar las constantes elásticas de los mismos por intermedio de la medición de la frecuencia natural de vibración de barras en diferentes modos y excitadas mediante un impacto puntual. En este trabajo se determinó el módulo de Young en muestras de cobre, aluminio y aleaciones de base cobre. Las mediciones se realizaron usando distintos modos de vibración: flexión en una barra apoyada y longitudinal. Como primer paso se determinó el módulo de Young de una muestra usando diferentes modos, encontrando consistencia en los resultados. Por otro lado, se determinó la variación del módulo de Young en función de la temperatura y parámetros microestructurales como el tamaño de grano. Se analizan las capacidades y desventajas del uso de la técnica de excitación por impulso como una alternativa de bajo costo en el ámbito de la investigación en metales y aleaciones.

show abstract

Elastic constants measurements of β Cu-Al-Be alloys

Cited by 11 publications

References 5 publications

Surface Nanostructuring of a CuAlBe Shape Memory Alloy Produces a 10.3 ± 0.6 GPa Nanohardness Martensite Microstructure

Surface Nanostructuring of a CuAlBe Shape Memory Alloy Produces a 10.3 ± 0.6 GPa Nanohardness Martensite Microstructure

Analysis of the Martensite Variant Selection in a Single Crystal Cu-Al-Be Shape Memory Alloy in a Tensile Test

Medición del módulo de Young en metales mediante la técnica de excitación por impulso

Contact Info

Product

Resources

About