Experimental evaluation of critical resolved shear stress for the first-order pyramidal c plus a slip in commercially pure Ti by micropillar compression method

被引:75
作者
Kishida, Kyosuke [1 ,2 ]
Kim, Jim Geum [1 ]
Nagae, Tadashige [1 ]
Inui, Haruyuki [1 ,2 ]
机构
[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan
[2] Kyoto Univ, Ctr Elements Strategy Initiat Struct Mat ESISM, Sakyo Ku, Kyoto 6068501, Japan
关键词
Titanium; Slip system; Dislocations; Mechanical properties; Micropillar compression; SINGLE-CRYSTALS; PLASTIC-DEFORMATION; YIELD STRENGTH; 1/3(1123)(1011) DISLOCATIONS; STACKING-FAULTS; HCP CRYSTALS; TITANIUM; SIZE; NUCLEATION; MECHANISM;
D O I
10.1016/j.actamat.2020.06.043
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The plastic deformation behavior of commercially pure Ti single crystals has been investigated by uniaxial micropillar compression tests as a function of crystal orientation and specimen size at room temperature. {10 (1) over bar1} (first-order) pyramidal c+a slip and prism a slip are activated in micropillar specimens with the [0001] and [2 (1) over bar(1) over bar0] orientations, respectively. {10 (1) over bar1} pyramidal c+a slip has never been observed to operate as a major deformation mode in compression tests of 'bulk' single crystals at room temperature, in which {11 (2) over bar2}<11<(2)over bar>(3) over bar> twinning is usually observed. The CRSS values for {10 (1) over bar1} pyramidal c+a slip and prism a slip increase with the decrease in the specimen size, following an inverse power-law relationship with a power-law exponent of about 0.06 and 0.59, respectively. The extrapolation of the inverse power-law relationship up to the 'bulk' specimen size estimated from the CRSS values of prism a slip gives the 'bulk' CRSS value for {10 (1) over bar1} pyramidal c+a slip to be 580-635 MPa, which is by far higher than those for any other deformation modes operative at room temperature. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.
引用
收藏
页码:168 / 174
页数:7
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