Influence of hydrostatic pressure on texture evolution in HPT deformed NiAl

17th International Conference on Textures of Materials

材料科学;物理学

Tränkner, C.^1 ; Chulist, R.^1,2 ; Skrotzki, W.^1 ; Lippmann, T.^3 ; Horky, J.^4 ; Zehetbauer, M.^4

Institut für Strukturphysik, Technische Universität Dresden, Dresden

D-01062, Germany^1

Instytut Metalurgii i Inzynierii Materialowej, Polskiej Akademii Nauk, Kraków

PL-30-059, Poland^2

Institut für Werkstoffforschung, Helmholtz-Zentrum Geesthacht, Geesthacht

D-21502, Germany^3

Physik Nanostrukturierter Materialien, Fakultät für Physik, Universität Wien, Wien

A-1090, Austria^4

关键词: Ambient pressures;    Brittle to ductile transition temperature;    Fracture stress;    High pressure torsions;    Low temperatures;    Standard conditions;    Texture and microstructures;    Texture evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012026/pdf
DOI  :  10.1088/1757-899X/82/1/012026

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

NiAl is an intermetallic compound with a brittle-to-ductile transition temperature of about 300°C at ambient pressure. At standard conditions, it is very difficult to deform, but fracture stress and fracture strain are increased under hydrostatic pressure (HP). On account of this, deformation at low temperatures is only possible at high HP, as for instance used in high pressure torsion (HPT). In order to study the influence of HP on texture evolution, small discs of polycrystalline NiAl were deformed by HPT at different temperatures ranging from room temperature to 500°C and different HPs. The influence of HP is presented for deformation at room temperature and 500°C. It is found that HP affects the formability of the samples as well as texture and microstructure.