Outstanding ductility of high-strength ultrafine-grained aluminium at cryogenic temperatures

被引：0

作者：

Orlova, T. S. ^{[1
]}

Sadykov, D. I. ^{[1
]}

机构：

[1] Ioffe Inst, St Petersburg, Russia

来源：

MATERIALS PHYSICS AND MECHANICS | 2024年 / 52卷 / 03期

关键词：

aluminium; ultrafine-grained structure; ductility; strength; cryogenic temperatures; MECHANICAL-PROPERTIES; DEFORMATION; SIZE;

D O I：

10.18149/MPM.5232024_7

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By decreasing the temperature of the tensile tests from 293 to 77 K, a drastic increase in ductility (elongation to failure similar to 40 % and uniform elongation similar to 25 %) was demonstrated for the first time, along with an increase in strength (yield stress similar to 235 MPa and ultimate tensile strength similar to 265 MPa) for ultrafine-grained aluminium structured by combination of equal-channel angular pressing and cold rolling with subsequent annealing. The increase in ductility at 77 K is accompanied by an increase in the strain hardening coefficient. The physical reasons for the significant increase in ductility at 77 K are discussed in comparison with the peculiarities of microstructure. The obtained combination of ductility and strength opens up prospects for the use of this material at cryogenic temperatures, as well as the application of cryogenic temperatures for the formation of its products of complex shapes.

引用

页码：73 / 79

页数：7

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