繰り返し引張圧縮負荷を受けるマイクロ銅単結晶のその場疲労損傷観察

抄録

In order to investigate the fatigue behavior of micron-scale metals, we developed a new apparatus that can apply a tension-compression cyclic load to a small specimen. The apparatus can not only hold the micron-scale specimen without introduction of pre-strain but also apply a compression load to the specimen without buckling. We conducted a fatigue experiment using a copper single crystal micron-scale specimen. Cyclic deformation generated intrusion/extrusion with a width of a few tens nanometers in the specimen, which was much narrower than that of bulk counterparts. In addition, the intrusions/extrusions propagated the test section with increase of cycle number. This result indicates that micron-scale metal possesses characteristic fatigue behavior.