TEMPERATURE SENSITIVITY AND PREDICTION OF THE MECHANICAL BEHAVIORS OF ULTRAFINE GRAINED ALUMINUM UND

• 作 者: Quanwei Zhan Tao Suo Cunxian Wang Kui Xie Zhongbin Tang
• 机 构: Institute of UAV research, Northwestern Polytechnical University,School of Aeronautics, Northwestern
• 出 处: Acta Mechanica Solida Sinica
• 发表日期: 2014年04期
• 关键词: ultrafine constitutive refined hardening coarse micrometer compressive ECAP soft

In the present work, we explore the strain hardening behaviors as well as the effect of temperature on the plastic deformation of ultrafine grained aluminum. The temperature sensitivity is determined and compared with that of coarse grained material. The results indicate that the flow stress of ultrafine grained aluminum displays enhanced sensitivity to temperature. The reduction in activation volume is suggested to be the major reason for the enhanced temperature sensitivity as grain size is refined into the sub-micrometer regime. Finally, a phenomenological constitutive model is proposed to describe the post-yield response of ultrafine grained aluminum.

The temperature work is determined and compared with that of coarse grained material. The results indicate that the flow stress of ultrafine grained aluminum displays enhanced sensitivity to temperature. The reduction in activation volume is suggested to be the major reason for the enhanced temperature sensitivity as grain size is refined into the sub-micrometer regime. Finally, a phenomenological constitutive model is proposed to describe the post- yield response of ultrafine grained aluminum.