Observation of Morphology Changes of Fine Eutectic Si Phase in Al-10%Si Cast Alloy during Heat Treatment by Synchrotron Radiation Nanotomography

被引：13

作者：

Furuta, Shougo ^{[1
]}

Kobayashi, Masakazu ^{[1
]}

Uesugi, Kentaro ^{[2
]}

Takeuchi, Akihisa ^{[2
]}

Aoba, Tomoya ^{[1
]}

Miura, Hiromi ^{[1
]}

机构：

[1] Toyohashi Univ Technol, Dept Mech Engn, Toyohashi, Aichi 4418580, Japan

[2] Japan Synchrotron Radiat Res Inst, Res & Utilizat Div, Sayo, Hyogo 6795198, Japan

来源：

MATERIALS | 2018年 / 11卷 / 08期

关键词：

particle morphology; heat treatment; aluminum cast alloy; mechanical properties; Ostwald ripening; nanotomography; phase-contrast imaging; X-RAY TOMOGRAPHY; SHORT FATIGUE-CRACK; ALUMINUM-ALLOY; SOLIDIFICATION SEQUENCE; DUCTILE FRACTURE; FIELD SIMULATION; BULK DIFFUSION; PINCH-OFF; NUCLEATION; MICROSTRUCTURE;

D O I：

10.3390/ma11081308

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A series of three-dimensional morphology changes of fine eutectic Si-particles during heat treatment have been investigated in Self-modified and Sr-modified Al-10%Si cast alloys by means of synchrotron radiation nanotomography utilizing a Fresnel zone plate and a Zernike phase plate in this study. The coral-like shape particles observed in Sr-modified cast alloy fragmented at branch and neck during heat treatment at 773 K. The fragmentation occurred up to 900 s. After that, the fragmented particles grew and spheroidized by Ostwald ripening. On the other hand, rod-like shaped eutectic Si-particles observed in self-modified cast alloy were larger in size compared with the particle size in Sr-modified cast alloy. Separation of eutectic Si-particles in Self-modified cast alloy occurred up to approximately 900 s, which was similar tendency to that in Sr-modified cast alloy. However, it was found that the morphology change behavior was very complex in rod-like shape Si-particles. The three-dimensional morphology changes of fine eutectic Si-particles in both cast alloys, specifically fragmentation and spheroidizing, can be connected to changes in mechanical properties.

引用

页数：13

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