The Mechanical Behavior of HAVAR Foils Using the Small Punch Technique

作者：Haroush Shlomo^*; Moreno Daniel; Silverman Ido; Turgeman Asher; Shneck Roni; Gelbstein Yaniv

来源：Materials, 2017, 10(5): 491.

DOI：10.3390/ma10050491

• small punch test
• SPT
• ball punch test
• BPT
• mechanical behavior
• Co-based alloy
• HAVAR
• TEM

Prediction of the mechanical behavior of thin foils (similar to 25 mu m) requires special characterization techniques. The current work is focused on the mechanical and microstructural characterization of 25 mu m HAVAR alloy foils following annealing, cold rolling, and subsequent heat treatments, using small punch testing (SPT), X-ray diffraction (XRD), and transmission-scanning electron microscopy (TEM). The SPT technique revealed that the annealed specimens exhibited the largest maximal load to failure and deformation (more than two-fold), compared to the cold rolled and heat treated conditions. The microscopy observations revealed high dislocation density following cold rolling and subsequent heat treatments. Following annealing, a cubic crystallographic structure (FCC) with equiaxed grains and a limited dislocation population was observed. Following cold rolling and subsequent thermal treatment, a preferred orientation texture (i.e., 'deformation texture') was observed with a very high dislocation density. The correlation between the mechanical behavior and the microstructural observations is discussed in detail.

• 出版日期2017-5