简介概要

Microstructure and mechanical properties of Mg-Cu-Y-Zn bulk metallic glass matrix composites prepared in low vacuum

来源期刊:中国有色金属学报(英文版)2008年增刊第1期

论文作者:王敬丰 吴夏 潘复生 汤爱涛 丁培道 刘日平

文章页码:278 - 282

Key words:bulk amorphous alloys; magnesium; commercially pure raw materials; microstructure; mechanical property

Abstract: Mg-Cu-Y-Zn bulk metallic glasses (BMG) and in situ bulk metallic glass matrix composites were prepared by copper mold casting under the low vacuum with the argon atmosphere, and the raw materials used in preparing the Mg-Cu-Y-Zn alloys were commercially pure materials. The microstructures of the bulk samples were analyzed by X-ray diffractometer (XRD) and the thermal stability of samples was investigated by using a differential scanning calorimeter (DSC). The thermal stability of sample prepared with commercially pure raw materials is close to that of sample prepared with the high pure raw materials for the BMG Mg65+X(Cu0.66Y0.33)30-XZn5 (X=6). With the increase of Mg content, Mg-Cu-Y-Zn composites are prepared, in which Mg solid solution flakes and Y2O3 flakes are dispersed. In comparison with monolithic Mg-based BMG alloys, the composites exhibit significant improvement in mechanical properties, e.g. a compressive plastic strain about 7% and an ultimate strength of 1 170 MPa in Mg65+X(Cu0.66Y0.33)30-XZn5 (X=14). It is suggested that the enhancement of the mechanical properties of the composites can be attributed to the generation of multiple shear bands and the quantity of the Mg solid solution flakes.

基金信息:the National Basic Research Program of China
the National Outstanding Youth Scientific Fund of China
he Project of CQ CSTC and the State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, China



详情信息展示

­­­ Microstructure and mechanical properties of Mg-Cu-Y-Zn bulk metallic glass matrix composites prepared in low vacuum

WANG Jing-feng(王敬丰)1, WU Xia(吴 夏)1, PAN Fu-sheng(潘复生)1, TANG Ai-tao(汤爱涛)1,

DING Pei-dao(丁培道)1, LIU Ri-ping(刘日平)2

1. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;

2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University,

Qinhuangdao 066004, China

Received 12 June 2008; accepted 5 September 2008

                                                                                                

Abstract: Mg-Cu-Y-Zn bulk metallic glasses (BMG) and in situ bulk metallic glass matrix composites were prepared by copper mold casting under the low vacuum with the argon atmosphere, and the raw materials used in preparing the Mg-Cu-Y-Zn alloys were commercially pure materials. The microstructures of the bulk samples were analyzed by X-ray diffractometer (XRD) and the thermal stability of samples was investigated by using a differential scanning calorimeter (DSC). The thermal stability of sample prepared with commercially pure raw materials is close to that of sample prepared with the high pure raw materials for the BMG Mg65+X(Cu0.66Y0.33)30-XZn5 (X=6). With the increase of Mg content, Mg-Cu-Y-Zn composites are prepared, in which Mg solid solution flakes and Y2O3 flakes are dispersed. In comparison with monolithic Mg-based BMG alloys, the composites exhibit significant improvement in mechanical properties, e.g. a compressive plastic strain about 7% and an ultimate strength of 1 170 MPa in Mg65+X(Cu0.66Y0.33)30-XZn5 (X=14). It is suggested that the enhancement of the mechanical properties of the composites can be attributed to the generation of multiple shear bands and the quantity of the Mg solid solution flakes.

Key words: bulk amorphous alloys; magnesium; commercially pure raw materials; microstructure; mechanical property

                                                                                                           

1 Introduction

Mg-based bulk metal glasses (BMG) exhibit great improvement in strength property and low density, particularly attractive for engineering applications[1-4]. But Mg-based bulk metal glasses have been found to be brittle at room temperature. They always fracture in the elastic regime without observable plastic deformation [5-7]. It has become one of the challenging problems for their engineering applications[8-10]. In the efforts to overcome the brittleness of BMG alloys, the preparation of BMG matrix composites by using in situ or ex situ methods has been proven to be an effective way. For example, the plastic strains to failure of Mg-based composites with ex situ TiB2 particles were found to reach the order of 2%-3%[11-12]. MA et al[13] synthesized Mg65Cu7.5Ni7.5Zn5Ag5Y10 BMG matrix in situ composites containing iron as secondary phase dispersions.

The macroscopic plasticity of the composite with 13% (volume fraction) of iron particles is about 1%, and the fracture strength is increased to 990 MPa. HUI et al[14] synthesized Mg-Cu-Y-Zn BMG matrix in situ composites containing Mg-based secondary phase with long-period order structure (LOS), the fracture strength is increased to 1 200 MPa, and the compressive plastic strain is increased to 18%.

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