|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Ultrafine Grained Materials IX
||The Formation of Growth Twins in Polycrystalline Al with High Stacking Fault Energy
||Sichuang Xue, Fan Zhe, Youxing Chen, Jin Li, Haiyan Wang, Xinghang Zhang
|On-Site Speaker (Planned)
Metals with nanotwins have shown high strength and high ductility. High density growth twins in metals with low stacking fault energy, such as Cu and Ag, have been extensively studied. In contrast, growth twins are rarely observed in metals with high stacking fault energy, such as pure Al. In this study, however, we report the observation of growth twins in sputtered polycrystalline Al films on amorphous substrates and a majority of these growth twins are inclined to the growth direction. Although the fraction of twinned grains is low in general, it clearly depends on film thickness. The nucleation mechanism for the inclined twins is compared with that of parallel growth twins in Al. Different twin formation mechanisms are discussed. This study provides a new perspective to promote the formation of growth twins in metals with high stacking fault energy.