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Annual Report:
Deformation twinning in FCC crystals
The investigation shows that crystallographic orientation and SFE have a remarkable influence on the process of deformation twinning in FCC crystals. For Al single crystal, only microtwins or stacking faults were found to nucleate although a preferential crystallographic orientation was selected, indicating that SFE plays a critical role in deformation twinning.......
Annual Report:
Shear deformation and plasticity of metallic glass
The evolution of multiple shear bands in a Zr-based metallic glass under multiaxial loading was systematically investigated by the small punch test. Unlike the fast propagation of the individual shear band and catastrophic failure of the metallic glass under uniaxial tensile or compressive loading, the metallic glass can be controlled to create regularly arrayed fine multiple shear bands under multiaxial loading........
Annual Report:
Fatigue cracking mechanism along twin boundaries
Two kinds of cracking modes adajcent to the TBs were observed, i.e. slip band and TB-cracking modes, depending on the SFE or slip mode. These new findings provide some experimental evidence for the optimum design of alloys with different SFEs to resist fatigue cracking along TBs........
Annual Report:
Fatigue damage behaviors of FCC crystals
Cyclic deformation behaviors of fcc metals, especially Cu and Ag single crystals were compared. It is found that the dislocation patterns of fatigued Cu and Ag single crystals display similar feature with ladder-like persistent slip bands (PSBs). The current finding confirms that, after Cu and Ni, Ag is the third pure fcc metal to form the ladder-like PSB structure........
Materials fatigue and fracture Division
Institute of Metal Research
Address:72 Wenhua Road, Shenyang, China
Postalcode:110016
