Microstructure and mechanical behavior of nanotwinned AlTi alloys with 9R phase

SCRIPTA MATERIALIA

卷:148

Article

Zhang, Y. F.¹  Xue, S.¹  Li, Q.¹  Fan, C.¹  Su, R.¹  Ding, Jie¹  Wang, Han¹  Wang, H.^1,2  Zhang, X.¹ 

[1] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA

[2] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA

关键词: Aluminum alloys;    Thin film;    Sputtering;    Nanoindentation;    ITB and 9R;   

DOI  :  10.1016/j.scriptamat.2018.01.010

来源: Elsevier

【 摘 要 】

Nanotwinned metals have shown high strength and ductility. However, metals with high stacking fault energy, such as Al, typically do not contain high-density growth twins or stacking faults. Here we show that by using a small amount of Ti solutes, 0.15-5.1 at.%, fine grains with a large population of extended incoherent twin boundaries bounding broad 9R phase form in sputtered AlTi films. These nanotwinned AlTi films have hardness as high as 2 GPa. This study provides an alternative approach to design high-strength Al alloys by grain refinement and introducing high-density twin boundaries and 9R phase. Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

Free