材料科学
合金
韧性
等轴晶
层状结构
延展性(地球科学)
可塑性
延伸率
复合材料
钛合金
变形(气象学)
分层(地质)
亚稳态
断裂韧性
超塑性
变形机理
冶金
极限抗拉强度
微观结构
蠕动
古生物学
构造学
物理
量子力学
生物
俯冲
作者
Chongle Zhang,Shuaiyang Liu,Jinyu Zhang,Dongdong Zhang,J. Kuang,Xiangyun Bao,Gang Liu,Jun Sun
标识
DOI:10.1038/s41467-023-37155-y
摘要
Metastability-engineering, e.g., transformation-induced plasticity (TRIP), can enhance the ductility of alloys, however it often comes at the expense of relatively low yield strength. Here, using a metastable Ti-1Al-8.5Mo-2.8Cr-2.7Zr (wt.%) alloy as a model material, we fabricate a heterogeneous laminated structure decorated by multiple-morphological α-nanoprecipitates. The hard α nanoprecipitate in our alloy acts not only as a strengthener to the material, but also as a local stress raiser to activate TRIP in the soft matrix for great uniform elongation and as a promoter to trigger interfacial delamination toughening for superior fracture resistance. By elaborately manipulating the activation sequence of lamellar-thickness-dependent deformation mechanisms in Ti-1Al-8.5Mo-2.8Cr-2.7Zr alloys, the yield strength of the present submicron-laminated alloy is twice that of equiaxed-coarse grained alloys with the same composition, yet without sacrificing the large uniform elongation. The desired mechanical properties enabled by this strategy combining the laminated metastable structure and trifunctional nanoprecipitates provide new insights into designing ultra-strong and ductile materials with great toughness.
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