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Titolo:
MELTING PROCESS OF NANOMETER-SIZED IN PARTICLES EMBEDDED IN AN AL MATRIX SYNTHESIZED BY BALL-MILLING
Autore:
SHENG HW; XU J; YU LG; SUN XK; HU ZQ; LU K;
Indirizzi:
CHINESE ACAD SCI,STATE KEY LAB RSA,INST MET RES SHENYANG 110015 PEOPLES R CHINA
Titolo Testata:
Journal of materials research
fascicolo: 11, volume: 11, anno: 1996,
pagine: 2841 - 2851
SICI:
0884-2914(1996)11:11<2841:MPONIP>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-MICROSCOPY; FREEZING BEHAVIOR; POROUS GLASSES; SN; ALUMINUM; POWDERS; METALS; STATE; MICROSTRUCTURE; AMORPHIZATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
H.W. Sheng et al., "MELTING PROCESS OF NANOMETER-SIZED IN PARTICLES EMBEDDED IN AN AL MATRIX SYNTHESIZED BY BALL-MILLING", Journal of materials research, 11(11), 1996, pp. 2841-2851

Abstract

Dispersions of nanometer-sized In particles embedded in an Al matrix (10 wt. % In) have been synthesized by ball milling of a mixture of Aland In powders. The as-milled product was characterized by using x-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive x-ray spectrometer (EDX), transmission electron microscopy (TEM),and high resolution transmission electron microscopy (HREM), respectively. It was found that In and Al are pure components immiscible with each other, with nanometer-sized In particles dispersively embedded inthe Al matrix. The melting behavior of In particles was investigated by means of differential scanning calorimeter (DSC). The calorimetric measurements indicate that both the melting point and the melting enthalpy of the In nanoparticles decrease with increasing milling time, orrefinement of the In particles. Compared to its bulk melting temperature, a melting point depression of 13.4 K was observed when the mean grain size of In is 15 nm, and the melting point depression of In nanoparticles is proportional to the reciprocal of the mean grain size. Themelting enthalpy depression was interpreted according to the two-state concept for the nanoparticles. Melting of the interface was deduced to be an exothermal process due to its large excess energy/volume.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/09/20 alle ore 17:22:56