В области низких температур (100-300 K) исследовано изменение внутреннего трения, модуля Юнга и электросопротивления поликристаллического титана двух марок (ВT1-0 и Grade 4) в зависимости от исходной структуры и последующей интенсивной пластической деформации, переводящей материал по размеру зерна в субмикрокристаллическое структурное состояние. В субмикрокристаллическом титане обнаружен максимум внутреннего трения, который интерпретирован как пик Бордони. Все исследованные характеристики являются чувствительными индикаторами неравновесности границ зерен после деформации. Выявлено влияние исходной структуры металла на его свойства после интенсивной деформации. Исследование выполнено за счет гранта Российского научного фонда (проект N 15-12-30010). DOI: 10.21883/FTT.2017.12.45231.131
Presented results of active resistance frequency dependence measurements of a circular cross-section aluminum and copper conductors with a various diameter in a wide frequency range from 20Hz to 2MHz. Using the skin effect simulation we show that for all types of wires an increased active resistance observed, compared to the theoretical values in the frequency range above 200 kHz, where the skin layer thickness becomes less than 200 μm. This phenomenon may be associated with the manufacturing process of a metal wire by drawing through a die, when defects are formed in the near-surface layer, leading to its increased resistivity.
The effect of elevated temperatures on elastic and microplastic properties of ultrafine-grained titanium prepared by severe plastic deformation is discussed. Three sets of a-titanium VT1-0, Grade-4 and PT3-V which differ each other in polycrystal structure and impurity content were investigated. As experiments show, significant changes in grain sizes, elastic and microplastic properties were observed only for the purest titanium VT1-0. The thermal stability of other sets of titanium (Grade-4 and PT3-V) was found to be better; it is explained by higher impurity content in these materials.
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