Mechanical properties of bulk metallic glasses composites during high temperature structural relaxation

doi:10.13373/j.cnki.cjrm.2015.02.005

	Mechanical properties of bulk metallic glasses composites during high temperature structural relaxation
	Zhang, Xiangyun; Yuan, Zizhou; Feng, Xuelei; Cui, Lizhi; Li, Duanxian
刊名	Xiyou Jinshu/Chinese Journal of Rare Metals
	2015-02-01
卷号	39 期号:2 页码:124-129
关键词	Annealing Binary alloys Composite materials Copper alloys Differential scanning calorimetry Fracture Free volume Glass High resolution transmission electron microscopy Mechanical properties Metallic glass Microstructure Morphology Particle size Plasticity Scanning electron microscopy Shear bands Silver alloys Structural relaxation Volume fraction Zircaloy Bulk metallic glass Bulk metallic glass composites Crystallization products High temperature Micro-scale particles Nano-sized particles Strength and plasticities Uniaxial compression experiment
ISSN号	02587076
DOI	10.13373/j.cnki.cjrm.2015.02.005
英文摘要	Cu40Zr44Al8Ag8 bulk metallic glass composites (BMGCs) were prepared by copper-mold suction casting method and annealed for various time (5, 10, 15, 20, 25, 40, 60, 85 min) at glass transaction temperature. Uniaxial compression experiments were employed to detect the mechanical properties of the samples before and after annealing. Microstructure and fracture surfaces of the samples were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). Results showed that the structure of the as-cast sample was mainly amorphous. A very small volume fraction of micro- and nano-sized Al3Zr intermetallic compounds dispersed in the amorphous matrix. The size and morphology of the micro-scale particles did not change during the long annealing process, and the cracks originated from these particles. But the volume fraction of nano-sized particles increased during annealing. The ultimate crystallization products were Al3Zr, Cu10Zr7 and Ag3Al phases. The crystals, together with free volumes in the amorphous matrix, controlled mechanical properties of the BMGCs. At the beginning of the annealing process, the strength and plasticity of BMGCs increased slowly and reached their peaks when the samples were annealed for 15 min. The optimal strength and plasticity of the BMGCs were 1.77 GPa and 1.67%, respectively. Then, the free volume reduced with the increase of annealing time, leading to a sharp decrease of mechanical properties. Furthermore, the fracture modes shifted from a single shear band to multi-shear band and eventually brittle fracture. ©, 2015, Editorial Office of Chinese Journal of Rare Metals. All right reserved.
语种	中文
出版者	Editorial Office of Chinese Journal of Rare Metals
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/112378]
专题	材料科学与工程学院
作者单位	State Key Laboratory of Advanced Nonferrous Materials, Lanzhou University of Technology, Lanzhou; 730050, China
推荐引用方式 GB/T 7714	Zhang, Xiangyun,Yuan, Zizhou,Feng, Xuelei,et al. Mechanical properties of bulk metallic glasses composites during high temperature structural relaxation[J]. Xiyou Jinshu/Chinese Journal of Rare Metals,2015,39(2):124-129.
APA	Zhang, Xiangyun,Yuan, Zizhou,Feng, Xuelei,Cui, Lizhi,&Li, Duanxian.(2015).Mechanical properties of bulk metallic glasses composites during high temperature structural relaxation.Xiyou Jinshu/Chinese Journal of Rare Metals,39(2),124-129.
MLA	Zhang, Xiangyun,et al."Mechanical properties of bulk metallic glasses composites during high temperature structural relaxation".Xiyou Jinshu/Chinese Journal of Rare Metals 39.2(2015):124-129.