Nanoindentation into a bcc high-entropy HfNbTaTiZr alloy-an atomistic study of the effect of short-range order

被引:5
作者
Alhafez, Iyad Alabd [1 ]
Deluigi, Orlando R. [2 ,3 ]
Tramontina, Diego [2 ,3 ]
Merkert, Nina [1 ]
Urbassek, Herbert M. [4 ,5 ]
Bringa, Eduardo M. [2 ,3 ,6 ]
机构
[1] Tech Univ Clausthal, Inst Appl Mech, Adolph Roemer Str 2A, D-38678 Clausthal Zellerfeld, Germany
[2] Univ Mendoza, CONICET, RA-5500 Mendoza, Argentina
[3] Univ Mendoza, Fac Ingn, RA-5500 Mendoza, Argentina
[4] Univ Kaiserslautern Landau, Phys Dept, Erwin Schrodinger Str, D-67663 Kaiserslautern, Germany
[5] Univ Kaiserslautern Landau, Res Ctr OPTIMAS, Erwin Schrodinger Str, D-67663 Kaiserslautern, Germany
[6] Univ Mayor, Fac Ciencias, Ctr Nanotecnol Aplicada, Santiago 8580745, Chile
来源
SCIENTIFIC REPORTS | 2024年 / 14卷 / 01期
关键词
Molecular dynamics; Nanoindentation; Dislocations; Plasticity; High-entropy alloys; DISLOCATION NUCLEATION; MECHANICAL-PROPERTIES; ELASTIC-MODULUS; DEFORMATION; INDENTATION; POTENTIALS; SIMULATION; TANTALUM; HARDNESS; TENSILE;
D O I
10.1038/s41598-024-59761-6
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The plastic response of the Senkov HfNbTaTiZr high-entropy alloy is explored by means of simulated nanoindentation tests. Both a random alloy and an alloy with chemical short-range order are investigated and compared to the well understood case of an elementary Ta crystal. Strong differences in the dislocation plasticity between the alloys and the elementary Ta crystal are found. The high-entropy alloys show only little relaxation of the indentation dislocation network after indenter retraction and only negligible dislocation emission into the sample interior. Short-range order-besides making the alloy both stiffer and harder-further increases the size of the plastic zone and the dislocation density there. These features are explained by the slow dislocation migration in these alloys. Also, the short-range-ordered alloy features no twinning plasticity in contrast to the random alloy, while elemental Ta exhibits twinning under high stress but detwins considerably under stress relief. The results are in good qualitative agreement with our current knowledge of plasticity in high-entropy alloys.
引用
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页数:13
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