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High cycle fatigue in the transmission electron microscope

Journal Article · · Nano Letters
 [1];  [2];  [1];  [2];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Hysitron, Inc., Eden Prairie, MN (United States)

One of the most common causes of structural failure in metals is fatigue induced by cyclic loading. Historically, microstructure-level analysis of fatigue cracks has primarily been performed post mortem. However, such investigations do not directly reveal the internal structural processes at work near micro- and nanoscale fatigue cracks and thus do not provide direct evidence of active microstructural mechanisms. In this paper, the tension–tension fatigue behavior of nanocrystalline Cu was monitored in real time at the nanoscale by utilizing a new capability for quantitative cyclic mechanical loading performed in situ in a transmission electron microscope (TEM). Controllable loads were applied at frequencies from one to several hundred hertz, enabling accumulations of 106 cycles within 1 h. The nanometer-scale spatial resolution of the TEM allows quantitative fatigue crack growth studies at very slow crack growth rates, measured here at ~10–12 m·cycle–1. This represents an incipient threshold regime that is well below the tensile yield stress and near the minimum conditions for fatigue crack growth. Evidence of localized deformation and grain growth within 150 nm of the crack tip was observed by both standard imaging and precession electron diffraction orientation mapping. Finally, these observations begin to reveal with unprecedented detail the local microstructural processes that govern damage accumulation, crack nucleation, and crack propagation during fatigue loading in nanocrystalline Cu.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Contributing Organization:
Hysitron, Inc., Eden Prairie, MN (United States)
Grant/Contract Number:
AC04-94AL85000; FG02-04ER83979; FG02-07ER84813
OSTI ID:
1271014
Report Number(s):
SAND2016--6822J; 645284
Journal Information:
Nano Letters, Journal Name: Nano Letters; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Application of In Situ TEM to Investigate Irradiation Creep in Nanocrystalline Zirconium journal August 2019
Direct Observation of Sink-Dependent Defect Evolution in Nanocrystalline Iron under Irradiation journal May 2017
Impact of uniaxial tensile fatigue on the evolution of microscopic and mesoscopic structure of carbon black filled natural rubber journal February 2019
Advanced microelectromechanical systems-based nanomechanical testing: Beyond stress and strain measurements journal June 2019
Progress toward autonomous experimental systems for alloy development journal April 2019

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