Grain size dependence of flow stress in ECAPed Ti with constant texture

来源期刊:中国有色金属学报(英文版)2012年第3期

论文作者:Chang-Young HYUN Ho-Kyung KIM

文章页码:673 - 677

Key words:Ti; mechanical properties; grain size; flow stress; equal channel angular pressing

Abstract: The effect of grain size on the flow stress in an ECAPed Ti with a constant texture was investigated, assuming that 2, 4, 5 and 6 passes microstructures have a similar texture. The average size of recrystallized grains decreased to 0.5 μm, 0.4 μm, and 0.3 μm with respect to the ECAP pass number of 2, 4, and 6, respectively. The ultimate tensile strength (UTS) and yield strength (YS) increase with an increase in the number of pressing. The UTS and YS of the 6 passes ECAPed sample were found to be 740.2 MPa and 580.3 MPa, respectively. An equation for the flow stress of an ECAPed Ti with a constant texture as a function of the strain and grain size was derived for the ECAPed metal. The following equation was finally obtained: σ(ε)=103.9+1825ε?9.6ε1/2·d?1/2+8.3d?1/2.

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