Mechanical properties of porous bulk glassy alloy prepared in high-pressure hydrogen atmosphere
Mechanical properties of porous bulk glassy alloy prepared in high-pressure hydrogen atmosphere
复制标题
DOI：
10.1016/j.msea.2006.02.337
复制
发表时间：
2007-03
期刊：
影响因子：
6.4
通讯作者：
T. Wada;A. Inoue;A. L. Greer
中科院分区：
文献类型：
--
作者：
T. Wada;A. Inoue;A. L. Greer
块状玻璃状Pd42.5Cu30Ni7.5P20（数字以.%表示）在高压氢气氛中采用水淬工艺制备了含有体积分数小于6%的细小球形孔的合金棒材。多孔合金棒的横截面和纵截面上的孔隙分布相当均匀。在压缩变形模式下，多孔合金的屈服强度略低于无孔合金，并表现出超过18%的大塑性应变。这些结果表明，引入小体积分数的孔隙是有效的，以提高塑性，而不会降低其机械强度。孔隙的有益作用来自于它们作为强大的应力集中器的作用，迫使剪切带在破坏应力以下扩散。
Bulk glassy Pd42.5Cu30Ni7.5P20(numbers indicate at.%) alloy rods containing fine spherical pores with the volume fraction less than 6% were prepared by a water quenching technique in high-pressure hydrogen atmosphere. The distribution of the pore is quite uniform in both transverse and longitudinal cross-section of the porous alloy rods. In compression deformation mode, the porous alloys have slightly low-yield strength compared with pore-free one and exhibit large plastic strain exceeding 18%. These results indicate that the introduction of small volume fraction of pores is effective to enhance the plasticity without much degradation of its mechanical strength. The beneficial effect of the pores comes from their action as powerful stress concentrators, forcing shear-band proliferation below the failure stress.