Aluminum (Al) alloys have a multitude of applications, notably in the automotive, aerospace and coating industries, yet they exhibit significantly lower mechanical strength than conventional steels. Nanotwins drastically improve mechanical strength while retaining ductility. However, the high SFE of Al largely prevents twinning. Here, we synthesize Al-Zr alloy films containing an abundance of incoherent twin boundaries and 9R phases. These alloys exhibit an extended solid solubility of Zr, retaining a columnar nanotwinned structure across all compositions. These films reach a hardness up to 4.2 GPa with 10 at% Zr and demonstrate the capacity for producing strong Al alloys with nanotwins.

铝（Al）合金具有多种应用，特别是在汽车，航空航天和涂料工业中，但它们的机械强度却比常规钢低得多。纳米孪晶可在保持延展性的同时大幅提高机械强度。但是，Al的高SFE在很大程度上防止了孪晶。在这里，我们合成了含有大量非相干孪晶界和9R相的Al-Zr合金膜。这些合金表现出扩展的Zr固溶度，在所有成分中均保持柱状纳米孪晶结构。这些膜的Zr含量为10 at％时，硬度达到4.2 GPa，并显示出生产具有纳米孪晶的坚固铝合金的能力。