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Heterophase Interface Dominated Deformation and Mechanical Properties in Al-Cu-Li Alloys
Advanced Theory and Simulations ( IF 2.9 ) Pub Date : 2021-04-29 , DOI: 10.1002/adts.202100059 Shuo Wang 1 , Chi Zhang 1 , Xin Li 1 , Junsheng Wang 2
Advanced Theory and Simulations ( IF 2.9 ) Pub Date : 2021-04-29 , DOI: 10.1002/adts.202100059 Shuo Wang 1 , Chi Zhang 1 , Xin Li 1 , Junsheng Wang 2
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As a common phenomenon in multiphase systems, interfacial deformation has a significant impact on the mechanical properties of materials. By utilizing the brittle cleavage and plastic slip modes, the deformation mechanism is tracked and mechanical properties of precipitate/matrix and precipitate/precipitate heterophase interfaces are induced in third-generation Al-Li alloys, including δ'(Al3Li)/α-Al, θ'(Al2Cu)/α-Al, and δ'(Al3Li)/θ'(Al2Cu) (depending on the ultrafine δ'/θ'/δ' composite precipitate). Based on bond energy and ideal stress calculations under tensile and shear deformations, it is noted that the universal interface separating the two phases is not the weakest link in these systems. In δ'/θ'/δ', specifically, the defined coherent interface I closing to the δ' may become a weak cracking point under tensile loading. Whereas, the semi-coherent interface II on the edge of the δ'/θ'/δ' tends to undergo interplanar slip along the [001] direction at relatively low shear stress. By releasing a partial dislocation under shear deformation, the local stable stacking fault can occur in this semi-coherent interface. And the interface-mediated plasticity within the ultrafine δ'/θ'/δ' composite precipitate could be expected to solve the origin of the strength-ductility conflict in modern Al-Li alloys. Besides, the electronic structures and atomic bonding are performed to reveal the mechanism behind the improved interface strength.
中文翻译：
Al-Cu-Li合金中异相界面主导变形和力学性能
作为多相系统中的普遍现象，界面变形对材料的力学性能有显着影响。利用脆性解理和塑性滑移模式，跟踪变形机制，并诱导第三代铝锂合金中析出物/基质和析出物/沉淀异相界面的力学性能，包括 δ'(Al 3 Li)/α- Al、θ'(Al 2 Cu)/α-Al、δ'(Al 3 Li)/θ'(Al 2Cu)（取决于超细 δ'/θ'/δ' 复合沉淀物）。根据拉伸和剪切变形下的键能和理想应力计算，注意到分离两相的通用界面并不是这些系统中最薄弱的环节。在 δ'/θ'/δ' 中，具体而言，靠近 δ' 的定义的相干界面 I 可能在拉伸载荷下成为弱裂纹点。而δ'/θ'/δ'边缘的半相干界面II在相对较低的剪切应力下倾向于沿[001]方向进行面间滑移。通过在剪切变形下释放部分位错，可以在该半相干界面中发生局部稳定的堆垛层错。以及超细 δ'/θ'/δ' 内的界面介导可塑性 复合析出物有望解决现代铝锂合金中强度-延展性冲突的根源。此外，还进行了电子结构和原子键合，以揭示界面强度提高背后的机制。
更新日期：2021-06-05
中文翻译：
Al-Cu-Li合金中异相界面主导变形和力学性能
作为多相系统中的普遍现象，界面变形对材料的力学性能有显着影响。利用脆性解理和塑性滑移模式，跟踪变形机制，并诱导第三代铝锂合金中析出物/基质和析出物/沉淀异相界面的力学性能，包括 δ'(Al 3 Li)/α- Al、θ'(Al 2 Cu)/α-Al、δ'(Al 3 Li)/θ'(Al 2Cu)（取决于超细 δ'/θ'/δ' 复合沉淀物）。根据拉伸和剪切变形下的键能和理想应力计算，注意到分离两相的通用界面并不是这些系统中最薄弱的环节。在 δ'/θ'/δ' 中，具体而言，靠近 δ' 的定义的相干界面 I 可能在拉伸载荷下成为弱裂纹点。而δ'/θ'/δ'边缘的半相干界面II在相对较低的剪切应力下倾向于沿[001]方向进行面间滑移。通过在剪切变形下释放部分位错，可以在该半相干界面中发生局部稳定的堆垛层错。以及超细 δ'/θ'/δ' 内的界面介导可塑性 复合析出物有望解决现代铝锂合金中强度-延展性冲突的根源。此外，还进行了电子结构和原子键合，以揭示界面强度提高背后的机制。
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