本文研究了纵向偏应力和切向偏应力对反常内耗效应的影响.纵向偏应力总是削弱反常内耗效应,而切向偏应力因施加方向的不同引起不同的内耗效应.偏应力效应在经过适当热处理和冷加工的合金试样中才体现出来.研究表明反常内耗峰(_3,P_2和P_1峰)与倾斜的位错弯结链密切相关。偏应力对内耗的应用将有助于位错结构的研究。
The influence of longitudinal and torsional bias stresses on anomalous amplitude-dependent internal friction was studied. The longitudinal bias stress may always weaken the anomalous amplitude-dependent effect, while the torsional one may induce different effects from different directions applied. Bias stress effect exhibits only in such alloy undergone proper heat treatment or cold working. The anomalous amplitude-dependent internal friction peaks, P_3, P_2 and P_1, are found to be related closely to slant dislocation kink chains. Thus, the application of bias stress to internal friction would be contributed to studying dislocation structure.
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