Achieving ultrahigh fatigue resistance in AlSi10Mg alloy by additive manufacturing

作者：Dan, Chengyi; Cui, Yuchi; Wu, Yi; Chen, Zhe^*; Liu, Hui; Ji, Gang; Xiao, Yakai; Chen, Han; Wang, Mingliang; Liu, Jun; Wang, Lei; Li, Yang; Addad, Ahmed; Zhou, Ying; Ma, Siming; Shi, Qiwei; Wang, Haowei; Lu, Jian^*

来源：Nature Materials, 2023, 22(10): 1182-+.

DOI：10.1038/s41563-023-01651-9

• HIGH-CYCLE FATIGUE
• LASER
• STRENGTH
• MICROSTRUCTURE
• MECHANISMS
• BEHAVIOR
• POROSITY
• FAILURE

Since the first discovery of the fatigue phenomenon in the late 1830s, efforts to fight against fatigue failure have continued. Here we report a fatigue resistance phenomenon in nano-TiB2-decorated AlSi10Mg enabled by additive manufacturing. This fatigue resistance mechanism benefits from the three-dimensional dual-phase cellular nanostructure, which acts as a strong volumetric nanocage to prevent localized damage accumulation, thus inhibiting fatigue crack initiation. The intrinsic fatigue strength limit of nano-TiB2-decorated AlSi10Mg was proven to be close to its tensile strength through the in situ fatigue tests of a defect-free microsample. To demonstrate the practical applicability of this mechanism, printed bulk nano-TiB2-decorated AlSi10Mg achieved fatigue resistance more than double those of other additive manufacturing Al alloys and surpassed those of high-strength wrought Al alloys. This strategy of additive-manufacturing-assisted nanostructure engineering can be extended to the development of other dual-phase fatigue-resistant metals. @@@ An ultrahigh fatigue-resistant AlSi10Mg alloy is achieved by additive manufacturing, with its three-dimensional dual-phase cellular nanostructure acting as a strong volumetric nanocage to inhibit fatigue damage accumulation.

• 单位
  上海交通大学