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Triple-interlocked-nanotwinned bulk magnesium alloys with exceptional strength and ageing resistance
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Triple-interlocked-nanotwinned bulk magnesium alloys with exceptional strength and ageing resistance
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Journal Article
Triple-interlocked-nanotwinned bulk magnesium alloys with exceptional strength and ageing resistance
2026
Overview
Nanoscale twin boundaries (TBs) effectively restrict the free motion of dislocations by intersecting with other TBs to realize high strength. However, the dislocations parallel to the TBs can glide along the TBs, resulting in detwinning for low strength. Herein, we present a triple-interlocked-nanotwinned (TIT) strategy for overcoming these inherent deficiencies. An Mg-9Li alloy was used as a proof-of-concept. The treated alloy had a large volume fraction of TIT interfaces (65.7%). It not only had a high yield strength of 508.6 MPa (approximately eleven times higher than that of the TIT-free sample) but also offered unprecedented ageing resistance, with a reduction in hardness of 6% after 730 days. The martensite-like phase transformation process concurrently triggers multiple-variant twins to form TIT structures. These TIT nets can effectively prohibit dislocation motion, reduce strengthening anisotropy, and disperse localized stress during the deformation process. This strategy of phase transformation twinning open a gate to fabricate other stronger metallic or ceramic nanotwinned bulk materials.
Nanotwinned materials are promising for structural applications. Here, a triple-interlocked-nanotwinned strategy via martensitic transformation is used to overcome intrinsic twin engineering deficiencies and achieve excellent mechanical properties.
