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The grain size (GS) dependence of fracture toughness (KIC) and static crack-growth resistance (KR) of superelastic NiTi with average GS from 10 to 1500nm are investigated. The measurements of strain and temperature fields at the crack-tip region are synchronized with the force–displacement curves under mode-I crack opening tests. It is found that with GS reduction down to nanoscale, the KIC and the...
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