Methods
The first step in making the small samples was to prepare, using FIB, a thin plate with dimensions of 100
In situ tensile straining experiments were carried out at room temperature using an FEI Tecnai F30 TEM operating at 300
The entire deformation process for each sample took about several minutes, but our e-beam illumination and videotaping was carried out for about one minute at a time, rather than continuously for each sample. In other words, the beam was alternately focused on different gauge sections and platelets while the others continued to deform without being observed or exposed to the beam. For a given sample, its deformation mode could not be controlled by beam effects, because much of its elongation occurred when the e-beam was moved to observe other samples one after another. The beam-heating effects should also be small because the temperature rise was estimated to be insignificant as our specimen was part of a large metal piece (Fig.
The strain rate was estimated to be typically about 100
Acknowledgements
Financial support from the National Nature Science Foundation of China (Grant Nos 50125103, 50671104 and 50625103) are gratefully acknowledged. The authors were also part of the MANS research team, supported in part by CAS.
Competing interests statement:
The authors declare no competing financial interests.
Received 11 June 2007; Accepted 18 July 2007; Published online 19 August 2007.
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