SAMPLE-SIZE EFFECTS ON THE COMPRESSION BEHAVIOR OF A Ni-BASED AMORPHOUS ALLOY

摘要：

Ni42Cu5Ti20Zr21.5Al8Si35 bulk metallic glasses rods with diameters of 1 mm and 3 mm, were prepared by arc melting of composing elements in a Ti-gettered argon atmosphere. The compressive deformation and fracture behavior of the amorphous alloy samples with different size were investigated by testing machine and scanning electron microscope. The compressive stress-strain curves of 1 mm and 3 mm samples exhibited 4.5％ and 0％ plastic strain, while the compressive fracture strength for 1 mm and 3 mm rod is 4691 MPa and 2631 MPa, respectively. The compressive fracture surface of different size sample consisted of shear zone and non-shear one. Typical vein patterns with some melting drops can be seen on the shear region of 1 mm rod, while fish-bone shape patterns can be observed on 3 mm specimen surface. Some interesting different spacing periodic ripples existed on the non-shear zone of 1 and 3 mm rods. On the side surface of 1 mm sample, high density of shear bands was observed. The skip of shear bands can be seen on 1 mm sample surface. The mechanisms of the effect of sample size on fracture strength and plasticity of the Ni-based amorphous alloy are discussed.

关键词： Bulk metallic glasses mechanical properties Ni-based alloy sample size

作者: WEIZHONG LIANG GUOGANG ZHAO LINZHI WU HONGJUN YU MING LI LIN ZHANG

作者单位: Postdoctoral Research Station on Mechanics, Harbin Institute of Technology, Harbin, Peoples Republi School of Materials Science and Engineering, Heilongjiang Institute of Science and Technology, Harbi Center for Composite Materials, Harbin Institute of Technology, Harbin, Peoples Republic of China

会议类型: 国际会议

会议名称: 第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)

会议地点: 哈尔滨

会议语种:英文

页码: 1324-1330

在线出版日期: 2008-09-03（万方平台首次上网日期，不代表论文的发表时间）