简介概要

In-situ dendrite reinforced Dy-based amorphous matrix composites

来源期刊:中国有色金属学报(英文版)2009年第1期

论文作者:武晓峰 赵威 孟力凯

文章页码:72 - 77

Key words:bulk metallic glasses(BMGs); composites; dysprosium(Dy); mechanical properties; deformation; fracture

摘    要:.

Abstract: In-situ dendritic reinforced Dy-Fe-Al amorphous matrix composites with a diameter of 3 mm were designed and fabricated by conventional Cu-mold casting method. XRD and SEM analyses were conducted to investigate the microstructure, the mechanical properties and the deformation and fracture behaviors of the composites. The forming mechanism and the deformation and fracture mechanism of the composites were discussed. The results indicate that the microstructures of composites consist of metallic glass matrix and α-Dy dendritic phase. The composites exhibit good mechanical properties with compressive fracture strength of 1 063 MPa, which is attributed to the effective bearing-load ability of the α-Dy dendrites and the glassy matrix and the restriction to the expanding of shear bands and cracks of the α-Dy dendrites. The nature of in-situ crystalline phases embedded in the amorphous matrix for in-situ crystallite reinforced Dy-Fe-Al amorphous matrix composites has a more important influence on the mechanical properties, the deformation and fracture behavior of the composites.

基金信息:the Natural Science Foundation of Liaoning Province, China



详情信息展示

In-situ dendrite reinforced Dy-based amorphous matrix composites

WU Xiao-feng(武晓峰), ZHAO Wei(赵 威), MENG Li-kai(孟力凯)

Faculty of Materials and Chemical Engineering, Liaoning University of Technology, Jinzhou 121001, China

Received 21 January 2008; accepted 19 May 2008

                                                                                                                                                                                                                                                        

Abstract: In-situ dendritic reinforced Dy-Fe-Al amorphous matrix composites with a diameter of 3 mm were designed and fabricated by conventional Cu-mold casting method. XRD and SEM analyses were conducted to investigate the microstructure, the mechanical properties and the deformation and fracture behaviors of the composites. The forming mechanism and the deformation and fracture mechanism of the composites were discussed. The results indicate that the microstructures of composites consist of metallic glass matrix and α-Dy dendritic phase. The composites exhibit good mechanical properties with compressive fracture strength of 1 063 MPa, which is attributed to the effective bearing-load ability of the α-Dy dendrites and the glassy matrix and the restriction to the expanding of shear bands and cracks of the α-Dy dendrites. The nature of in-situ crystalline phases embedded in the amorphous matrix for in-situ crystallite reinforced Dy-Fe-Al amorphous matrix composites has a more important influence on the mechanical properties, the deformation and fracture behavior of the composites.

Key words: bulk metallic glasses(BMGs); composites; dysprosium(Dy); mechanical properties; deformation; fracture

                                                                                                                                                                                                                                                                   

1 Introduction

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