Zr基大块非晶合金的微区变形及力学性能  

Deformation and mechanical properties of Zr-based bulk metallic glasses under nanoindenter

作　　者：武晓峰[1] 张海峰[2] 李宏[2] 王爱民[2] 杨洪才[1] 胡壮麒[2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004 [2]中国科学院金属研究所,沈阳110016

出　　处：《中国有色金属学报》2003年第6期1368-1373,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展规划资助项目 (G2 0 0 0 0 672 0 1) ;国家自然科学基金资助项目 (5 0 2 740 64 )

摘　　要：利用纳米压痕仪、扫描电镜等研究了Zr基大块非晶合金在纳米压痕条件下的变形及力学性能。Zr基大块非晶合金在纳米压头作用下以弹性塑性方式变形 ,载荷—位移曲线及压痕周边多重剪切带 (堆起或波纹状 )的特征证明了塑性变形的存在。冷却速度、第二相及退火等因素影响非晶合金的压痕硬度HV和弹性模量E ,冷却速度小的试样或部位 (如试样中心 )的HV ,E值略高 ;离第二相 (W丝 )越近 ,HV ,E值越高 ;退火处理提高非晶的HV ,E值 ,同时退火与第二相还明显改变压痕周边的变形状态及塑性变形量的大小 ,退火显著减小塑性变形量 ,使压痕周边凹陷 ,而第二相使压痕堆起消失。对塑性变形机理进行了初步分析。Deformation and mechanical properties of Zr-based bulk metallic glasses (BMGs) under nanoindenter and their affecting factors were studied by means of nanoindentation instrument and scanning electron microscope (SEM). The results indicate that Zr-based BMGs deform in an elastic-plastic mode under a nanoindenter. Load—displacement curve, multiple shear bands and ripple shape around a nanoindenter confirm the existence of a amount of plastic deformation. For pure quenched Zr-based BMGs, the larger the size of samples or the nearer the location away from the surface of a same sample, the smaller the values of microhardness and elastic modulus; annealing and tungsten fiber addition both enhance the values of HV and E, and significantly change the morphology around a nanoindenter and the amount of plastic deformation. The mechanism of plastic deformation is preliminarily analyzed.

关 键 词：锆基大块非晶合金 纳米压痕 变形 力学性能 扫描电镜 纳米压痕仪 

分 类 号：TG146.414[一般工业技术—材料科学与工程] TG139.8[金属学及工艺—金属材料]