Nano-scale characterisation of sheared β" precipitates in a deformed Al-Mg-Si alloy

被引：41

作者：

Christiansen, Emil ^{[1
,2
]}

Marioara, Calin Daniel ^{[1
,3
]}

Holmedal, Bjorn ^{[1
,4
]}

Hopperstad, Odd Sture ^{[1
,5
]}

Holmestad, Randi ^{[1
,2
]}

机构：

[1] NTNU Norwegian Univ Sci & Technol, CASA, N-7491 Trondheim, Norway

[2] NTNU, Dept Phys, Fac Nat Sci, N-7491 Trondheim, Norway

[3] SINTEF Ind, Mat & Nanotechnol, N-7465 Trondheim, Norway

[4] NTNU, Dept Mat Sci & Engn, Fac Nat Sci, N-7491 Trondheim, Norway

[5] NTNU, Fac Engn, Dept Struct Engn, N-7491 Trondheim, Norway

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

关键词：

ALUMINUM-ALLOY; DISLOCATION; SLIP; DEFORMATION; STRENGTH; CONTRAST; BEHAVIOR; FIELD;

D O I：

10.1038/s41598-019-53772-4

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：

This paper compares the nano-scale structure of beta" precipitates in a peak-aged Al-Mg-Si alloy before and after deformation. Three complementary advanced transmission electron microscopy techniques are used to reveal the structures and elucidate the interaction between dislocations and beta" precipitates. We show that the needle-like and semi-coherent beta" precipitates are sheared several times on different planes by dislocations during deformation, with no indications that they are bypassed or looped. Our results show that dislocations cut through precipitates and leave behind planar defects lying on planes inclined to "100" directions inside the precipitates. The results also indicate that precipitates are sheared in single steps, and the implication of this observation is discussed in terms of slip behaviour.

引用

页数：11

共 35 条

[1] The crystal structure of the β" phase in Al-Mg-Si alloys [J].