|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||PAN-56: Investigation on Activation Volume and Strain-rate Sensitivity in Ultrafine-grained Tantalum
||Yue Wang, Ying Liu, Jing Tao Wang
|On-Site Speaker (Planned)
The activation volume and strain-rate sensitivity(SRS) and their relationship are investigated. Through theoretical modeling based on the movement of both isolated kinks and kink pairs in a dislocation line, a new form of theoretical relationship between the SRS and activation volume was developed, which reduces to the conventional and frequently used form of the same relationship when SRS is approaching zero. The strain rate jump test during the necking stage of tensile testing process is validated through combined theoretical analytical approaches, for obtaining SRS of materials with short uniform tensile stage. To validate the theoretical approaches and modeling presented in this work, strain-rate jump tests and repeated stress relaxation experiments were conducted, to measure the SRS and activation volume of ultrafine-grained tantalum prepared by equal channel angular pressing. The experimental relationship between the SRS and the activation volume fits well with the new form of theoretical relationship.
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