On the effect of matrix relaxation during the melting of embedded indium particles

Malhotra, Anshoo; Aken, David C. Van

doi:10.1080/01418619508236230

Cited by 24 publications

(30 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the elevated melting point. Results for each of the cast alloys were similar to that reported by Malhotra and Van Aken [7]. Heat flow curves had a sharp peak initiating near 155.5°C, terminating near 160°C, and peaking near 157°C; while a broader peak was also present between 155°C and 170°C, which peaked between 163°C and 166°C.…”

supporting

confidence: 71%

“…Malhotra and Van Aken estimated a volume change of 2.5% upon melting [7,8]. Following the analysis of Ahn et al [26], the volume change due to the emission of multiple prismatic loops can be related to the number of emitted dislocations by Equation 2.…”

Section: Equationmentioning

confidence: 99%

“…The two peaks were deconvoluted by assuming superimposed Gaussian distributions. The first peak is interpreted as indium particles melting at the equilibrium temperature, 156.6°C [23], while the second peak represents elevated temperature melting as investigated previously by Malhotra and Van Aken [7]. The equilibrium peak ranged between 17% and 36% of the overall reaction, while the elevated melting peak ranged between 64% and 83%.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Room temperature direct space-selective growth of gold nanoparticles inside a silica matrix based on a femtosecond laser irradiation

Hamzaoui¹,

Bernard²,

Chahadih³

et al. 2010

Materials Letters

View full text Add to dashboard Cite

Melting point phenomena of micron-sized indium particles embedded in an aluminum matrix were studied by means of acoustic emission. The acoustic energy measured during melting increased with indium content. Acoustic emission during the melting transformation suggests a dislocation generation mechanism to accommodate the 2.5% volume strain required for melting of the embedded particles. A geometrically necessary increase in dislocation density of 4.1 x 10¹³ m⁻² was calculated for the 17 wt% indium composition.

show abstract

supporting

confidence: 71%

Section: Equationmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Room temperature direct space-selective growth of gold nanoparticles inside a silica matrix based on a femtosecond laser irradiation

Hamzaoui¹,

Bernard²,

Chahadih³

et al. 2010

Materials Letters

View full text Add to dashboard Cite

show abstract

“…The intrinsic mechanism for superheating is still controversial. More recently, Malhotra and Van Aken (1995) argued that the volume transformation stress upon melting was the major factor for the melting temperature elevation in microparticles. However, this does not seem to be the case in the melt-spun samples.…”

Section: Samplementioning

confidence: 99%

“…However, this scenario of melting is questionable because of the superheating of the entrained particles, which has been related to strain-energy effects (Allen et al 1980, Malhotra andVan Aken 1995), interface-energy effects (Saka et al 1988) and kinetic barriers to nucleation (Spiller 1982, DaÈ ges, Gleiter and Perepezko 1986, Zhang and Cantor 1991. It is worth noting that the superheated particles often have an epitaxial relationship with the containing hosts.…”

mentioning

confidence: 99%

Superheating and melting-point depression of Pb nanoparticles embedded in Al matrices

Sheng¹

1996

Philosophical Magazine Letters

135

View full text Add to dashboard Cite

Two kinds of Pb± Al granular sample (with nanometre-sized Pb particles embedded in an Al matrix) were prepared by using melt-spinning and ballmilling techniques. The Pb particles were synthesized with similar particle sizes, about 5± 30nm in diameter, but were observed to have different Pb± Al interfaces for samples prepared using different approaches. In the melt-spun Pb± Al samples, the Pb nanoparticles were seen to have an epitaxial relationship with the Al matrix, while the Pb particles in the ball-milled sample were seen to be randomly oriented with respect to the Al matrix. The melting behaviour of the Pb particles was investigated by differential scanning calorimetry. It was found that the faceted Pb nanoparticles in the melt-spun sample could be superheated by about 11± 40K, whereas the irregularly shaped Pb particles in the ball-milled sample melted about 13K below its equilibrium point. We suggest that different interface structures, which cause variations in energy differences between solid-Pb± solid-Al and liquid-Pb± solid-Al interfaces, are responsible for the different melting behaviour of Pb nanoparticles.

show abstract

Analysis of Acoustic Emission During the Melting of Embedded Indium Particles in an Aluminum Matrix: A Study of Plastic Strain Accommodation During Phase Transformation

Kuba

Aken

2012

Metall Mater Trans A

View full text Add to dashboard Cite

Acoustic emission is used here to study melting and solidification of embedded indium particles in the size range of 0.2 to 3 µm in diameter and to show that dislocation generation occurs in the aluminum matrix to accommodate a 2.5% volume change. The volume averaged acoustic energy produced by indium particle melting is similar to that reported for bainite formation upon continuous cooling. A mechanism of prismatic loop generation is proposed to accommodate the volume change and an upper limit to the geometrically necessary increase in dislocation density is calculated as 4.1 x 10 9 cm -² for the Al-17In alloy. Thermomechanical processing is also used to change the size and distribution of the indium particles within the aluminum matrix. Dislocation generation with accompanied acoustic emission occurs when the melting indium particles are associated with grain boundaries or upon solidification where the solid-liquid interfaces act as free surfaces to facilitate dislocation generation. Acoustic emission is not observed for indium particles that require super heating and exhibit elevated melting temperatures. The acoustic emission work corroborates previously proposed relaxation mechanisms from prior internal friction studies and that the superheat observed for melting of these micron-sized particles is a result of matrix constraint. I. INTRODUCTIONRecent study of the aluminum-indium system has shown that equilibrium melting of the indium particles can be detected by acoustic emission (AE) techniques [1]. AE results from rapid energy release that creates elastic pressure waves in a material. According to literature, displacive solid-state transformations generate AE resulting from the shear mechanism of transformation and diffusive transformations normally occur too slowly to generate AE [2]. In steels, martensite [2] and bainite [3] generate AE, but formation of allotriomorphic ferrite or the eutectoid product pearlite does not [2]. Formation of Widmanstätten ferrite has been suggested to also generate AE [3]. Consequently, displacive or martensitic-like solid-state transformations are often distinguished from diffusion controlled phase transformations by the presence of AE [4]. However, liquid-solid transformations are also known to exhibit AE as the solid contracts, i.e. most materials exhibit AE upon solidification but not melting [5]. The exact cause of solidification AE is debated [6], but may be due to frictional noise between solid crystals [7], cluster addition or subtraction from the solid-liquid interface [8], or perhaps casting separation from the mold wall. AE is detected in crystallizing polymers due to cavitation in areas of occluded liquid where shrinkage stresses overwhelm the cohesive strength of the melt and void formation occurs [9].Acoustic emission is also detected during tensile tests for dislocation creation and motion associated with a yield point drop [10] and for void nucleation at nonmetallic inclusions during ductile fracture processes [11]. However, even a small amount of prior cold w...

show abstract

On the effect of matrix relaxation during the melting of embedded indium particles

Cited by 24 publications

References 12 publications

Room temperature direct space-selective growth of gold nanoparticles inside a silica matrix based on a femtosecond laser irradiation

Room temperature direct space-selective growth of gold nanoparticles inside a silica matrix based on a femtosecond laser irradiation

Superheating and melting-point depression of Pb nanoparticles embedded in Al matrices

Analysis of Acoustic Emission During the Melting of Embedded Indium Particles in an Aluminum Matrix: A Study of Plastic Strain Accommodation During Phase Transformation

Contact Info

Product

Resources

About