In Situ Nanoindentation Studies on Detwinning and Work Hardening in Nanotwinned Monolithic Metals

Journal Article · Tue Jul 14 00:00:00 EDT 2015 · Journal of The Minerals, Metals & Materials Society

DOI:https://doi.org/10.1007/s11837-015-1518-1· OSTI ID:1304707

Liu, Y. ^[1]; Li, N. ^[2]; Bufford, D. ^[3]; Lee, J. H. ^[4]; Wang, J. ^[4]; Wang, H. ^[4]; Zhang, X. ^[4]

---

1. Texas A & M Univ., College Station, TX (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
3. Texas A & M Univ., College Station, TX (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
4. Texas A & M Univ., College Station, TX (United States)

Certain nanotwinned (nt) metals have rare combinations of high mechanical strength and ductility. Here, we review recent in situ nanoindentation studies (using transmission electron microscopes) on the deformation mechanisms of nt face-centered cubic metals including Cu, Ni, and Al with a wide range of stacking fault energy (SFE). Moreover, in nt Cu with low-to-intermediate SFE, detwinning (accompanied by rapid twin boundary migration) occurs at ultralow stress. In Ni with relatively high SFE, coherent {111} twin boundaries lead to substantial work hardening. Twinned Al has abundant {112} incoherent twin boundaries, which induce significant work-hardening capability and plasticity in Al. Finally, twin boundaries in Al also migrate but at very high stresses. Furthermore, molecular dynamics simulations reveal the influence of SFE on deformation mechanisms in twinned metals.

• Research Organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE
• Grant/Contract Number: AC52-06NA25396
• OSTI ID: 1304707
• Report Number(s): LA-UR--15-23096
• Journal Information: Journal of The Minerals, Metals & Materials Society, Journal Name: Journal of The Minerals, Metals & Materials Society Journal Issue: 1 Vol. 68; ISSN 1047-4838
• Publisher: Springer
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
coherent and incoherent twin boundary
detwinning
in situ nanoindentation
work hardening