TY - JOUR
T1 - Room-temperature deformation of single crystals of ZrB2 and TiB2 with the hexagonal AlB2 structure investigated by micropillar compression
AU - Chen, Zhenghao
AU - Paul, Bhaskar
AU - Majumdar, Sanjib
AU - Okamoto, Norihiko L.
AU - Kishida, Kyosuke
AU - Inui, Haruyuki
AU - Otani, Shigeki
N1 - Funding Information:
This work was supported by Grant-in-Aids for Scientific Research on innovative Areas on High Entropy Alloys through the grant number JP18H05450 and JP18H05451, and in part by JSPS KAKENHI grant numbers JP18H01735, JP18H05478, JP19H00824, JP19K22053, JP20K21084, the Elements Strategy Initiative for Structural Materials (ESISM) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan (Grant number JPMXP0112101000) and JST CREST (Grant number JPMJCR1994).
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - The plastic deformation behavior of single crystals of two transition-metal diborides, ZrB2 and TiB2 with the AlB2 structure has been investigated at room temperature as a function of crystal orientation and specimen size by micropillar compression tests. Although plastic flow is not observed at all for their bulk single crystals at room temperature, plastic flow is successfully observed at room temperature by the operation of slip on {11 ¯ 00}<112 ¯ 3> in ZrB2 and by the operation of slip on {11 ¯ 00}<0001> and {11 ¯ 00}<112 ¯ 0> in TiB2. Critical resolve shear stress values at room temperature are very high, exceeding 1 GPa for all observed slip systems; 3.01 GPa for {11 ¯ 00}<112 ¯ 3> slip in ZrB2 and 1.72 GPa and 5.17 GPa, respectively for {11 ¯ 00}<0001> and {11 ¯ 00}<112 ¯ 0> slip in TiB2. The identified operative slip systems and their CRSS values are discussed in comparison with those identified in the corresponding bulk single crystals at high temperatures and those inferred from micro-hardness anisotropy in the early studies.
AB - The plastic deformation behavior of single crystals of two transition-metal diborides, ZrB2 and TiB2 with the AlB2 structure has been investigated at room temperature as a function of crystal orientation and specimen size by micropillar compression tests. Although plastic flow is not observed at all for their bulk single crystals at room temperature, plastic flow is successfully observed at room temperature by the operation of slip on {11 ¯ 00}<112 ¯ 3> in ZrB2 and by the operation of slip on {11 ¯ 00}<0001> and {11 ¯ 00}<112 ¯ 0> in TiB2. Critical resolve shear stress values at room temperature are very high, exceeding 1 GPa for all observed slip systems; 3.01 GPa for {11 ¯ 00}<112 ¯ 3> slip in ZrB2 and 1.72 GPa and 5.17 GPa, respectively for {11 ¯ 00}<0001> and {11 ¯ 00}<112 ¯ 0> slip in TiB2. The identified operative slip systems and their CRSS values are discussed in comparison with those identified in the corresponding bulk single crystals at high temperatures and those inferred from micro-hardness anisotropy in the early studies.
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U2 - 10.1038/s41598-021-93693-9
DO - 10.1038/s41598-021-93693-9
M3 - Article
C2 - 34253780
AN - SCOPUS:85110594926
SN - 2045-2322
VL - 11
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 14265
ER -