Anelastic Behavior under Tensile and Shearing Stresses in Bulk Metallic Glasses
Anelastic Behavior under Tensile and Shearing Stresses in Bulk Metallic Glasses
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DOI：
10.2320/matertrans.43.1957
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发表时间：
2002-08
影响因子：
1.2
通讯作者：
K. Fujita;A. Inoue;Tao Zhang;N. Nishiyama
中科院分区：
文献类型：
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作者：
K. Fujita;A. Inoue;Tao Zhang;N. Nishiyama
通过拉伸试验可知，非晶质薄带合金比结晶质金属合金更显着地发生滞弹性变形。此外，对Cu单组分非晶金属拉伸和剪切试验的分子动力学模拟结果表明，在剪切应力下比在拉伸应力下更显着地发生滞弹性变形。在本报告中，实际上对块体金属玻璃进行了拉伸和扭转测试，以检查剪切应力和拉伸应力下迟弹性行为的差异。单相块体金属玻璃 La60Al20Ni10Cu5Co5、Pd40Cu30Ni10P20 和 Zr55Cu30Ni5Al10 (at%) 与钢 JIS SGD 400-D 一起被选为金属晶体的代表。试验片为圆棒状，平行计量截面的直径为4～10mm。在拉伸应力和剪切应力下没有观察到钢的滞弹性行为。尽管金属玻璃在拉应力下没有表现出明显的滞弹性变形，但剪切应力模式即使在低应力水平下也会导致显着的滞弹性变形。滞弹性变形量随着剪切应力水平的增加而增加。
It is known that an anelastic deformation occurs more remarkably for amorphous ribbon alloys than for crystalline metallic alloys by the tensile test. In addition, the result of the molecular dynamics simulation on tensile and shearing tests for Cu single component amorphous metal has indicated that the anelastic deformation occurs more remarkably under the shearing stress rather than under the tensile stress. In this report, tensile and torsional tests were actually performed for bulk metallic glasses to examine the difference in the anelastic behavior under shearing and tensile stresses. Single-phase bulk metallic glasses, La60Al20Ni10Cu5Co5, Pd40Cu30Ni10P20 and Zr55Cu30Ni5Al10 (at%), were chosen together with a steel, JIS SGD 400-D, as a representative of metallic crystals. The test specimens were a round bar shape and the diameters of a parallel gage section were 4 to 10 mm. No anelastic behavior was observed for the steel under tensile and shearing stresses. Although the metallic glasses did not exhibit distinct anelastic deformation under the tensile stress, the shearing stress mode leads to a significant anelastic deformation even at low stress level. The amount of the anelastic deformation increases with an increase in the shearing stress level.