Erratum: Microstructure, phase transformation and hardness of nanometric Cr-Al multilayer coatings (Adv Mech Eng (2015) 7:6 (1-7) DOI: 10.1177/1687814015589721)

The names of four authors (Kai-Wen Cheng, Joachim Mayer, Thomas E Weirich and Alexander Schwedt) were omitted. The authors apologise for this error. The correct author listing is as follows: Yean-Liang Su¹, Kai-Wen Cheng¹, Joachim Mayer², Thomas E Weirich², Alexander Schwedt² and Yue-Feng Lin¹¹Department of Mechanical Engineering, National Cheng-Kung University, 701 Tainan, Taiwan ²Central Facility for Electron Microscopy GFE, RWTH Aachen University, 52074 Aachen, Germany The online version of the article will be corrected.