In Situ TEM tensile testing of bicrystals with tailored misorientation angles

被引：11

作者：

Kiani, Mehrdad T. ^{[1
]}

Gan, Lucia T. ^{[2
]}

Traylor, Rachel ^{[2
]}

Yang, Rui ^{[2
]}

Barr, Christopher M. ^{[4
]}

Hattar, Khalid ^{[4
]}

Fan, Jonathan A. ^{[2
]}

Gu, X. Wendy ^{[3
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Palo Alto, CA 94305 USA

[2] Stanford Univ, Dept Elect Engn, Palo Alto, CA 94305 USA

[3] Stanford Univ, Dept Mech Engn, Palo Alto, CA 94305 USA

[4] Sandia Natl Labs, Ctr Integrated Nanotechnol, Albuquerque, NM 87185 USA

来源：

ACTA MATERIALIA | 2022年 / 224卷

基金：

美国国家科学基金会;

关键词：

Fracture; Plasticity; Dislocations; Grain boundaries; GRAIN-BOUNDARY FRACTURE; DEFORMATION MECHANISMS; PLASTIC COLLAPSE; DISLOCATION NUCLEATION; SILVER NANOWIRES; CRACK-GROWTH; THIN-FILMS; SIZE; STRENGTH; BEHAVIOR;

D O I：

10.1016/j.actamat.2021.117505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Grain boundaries have complex structural features that influence strength, ductility and fracture in met -als and alloys. Grain boundary misorientation angle has been identified as a key parameter that controls their mechanical behavior, but the effect of misorientation angle has been challenging to isolate in poly-crystalline materials. Here, we describe the use of bicrystal Au thin films made using a rapid melt growth process to study deformation at a single grain boundary. Tensile testing is performed on bicrystals with different misorientation angles using in situ TEM, as well as on a single crystalline sample. Plastic de-formation is initiated through dislocation nucleation from free surfaces. Grain boundary sliding is not observed, and failure occurs away from the grain boundary through plastic collapse in all cases. The fail-ure behavior in these nanoscale bicrystals does not appear to depend on the misorientation angle or grain boundary energy but instead has a more complex dependence on sample surface structure and dislocation activity.(c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：8

共 75 条

[1] Grain Boundary Sliding in Aluminum Nano-Bi-Crystals Deformed at Room Temperature [J].

Aitken, Zachary H. ;

Jang, Dongchan ;

Weinberger, Christopher R. ;

Greer, Julia R. .

SMALL, 2014, 10 (01) :100-108

[2]

Armstrong R.W., 2015, PHILOS T R SOC A, V373

[3] Effects of focused ion beam milling on the nanomechanical behavior of a molybdenum-alloy single crystal [J].

Bei, H. ;

Shim, S. .

APPLIED PHYSICS LETTERS, 2007, 91 (11)

[4] INTRINSIC INTERGRANULAR BRITTLENESS OF MOLYBDENUM [J].

BROSSE, JB ;

FILLIT, R ;

BISCONDI, M .

SCRIPTA METALLURGICA, 1981, 15 (06) :619-623

[5] MECHANICAL PROPERTIES OF THIN SINGLE-CRYSTAL GOLD FILMS [J].

CATLIN, A ;

WALKER, WP .

JOURNAL OF APPLIED PHYSICS, 1960, 31 (12) :2135-2139

[6] The plastic collapse of sandwich beams with a metallic foam core [J].

Chen, C ;

Harte, AM ;

Fleck, NA .

INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, 2001, 43 (06) :1483-1506

[7] Grain boundary engineering: fatigue fracture [J].

Das, Arpan .

PHILOSOPHICAL MAGAZINE, 2017, 97 (11) :867-916

[8] Miniaturized single-crystalline fcc metals deformed in tension: New insights in size-dependent plasticity [J].

Dehm, Gerhard .

PROGRESS IN MATERIALS SCIENCE, 2009, 54 (06) :664-688

[9] A universal scaling law for the strength of metal micropillars and nanowires [J].

Dou, R. ;

Derby, B. .

SCRIPTA MATERIALIA, 2009, 61 (05) :524-527

[10] Tensile behavior of free-standing gold films. Part II. Fine-grained films [J].

Emery, RD ;

Povirk, GL .

ACTA MATERIALIA, 2003, 51 (07) :2079-2087

← 1 2 3 4 5 6 7 8 →