Dislocation-θ′ (Al2Cu) interactions during creep deformation of an Al-Cu alloy
Dislocation-θ′ (Al2Cu) interactions during creep deformation of an Al-Cu alloy
复制标题
Al-Cu 合金蠕变变形过程中的位错-β (Al2Cu) 相互作用
DOI：
10.1016/j.scriptamat.2022.114739
复制
发表时间：
2022
影响因子：
6
通讯作者：
Shyam, Amit
中科院分区：
文献类型：
--
作者：
Milligan, Brian;Ma, Dong;Allard, Lawrence;Clarke, Amy;Shyam, Amit
虽然Al-Cu合金拉伸过程中的析出-位错交互作用已为人们所熟知，但蠕变行为的研究却少之又少。新型热稳定铝铜合金具有θ‘(Al2Cu)作为强化析出物，可保持稳定到300oC(∼为熔化温度的60%)或更高，此时蠕变对力学行为至关重要。用原位电子衍射和扫描电子显微镜研究了这种Al-Cu合金中的析出-位错相互作用。有大量的载荷转移到θ‘相，这可以归因于θ’和Al基体界面上的位错环。因此，Orowan环被认为是沉淀-位错相互作用的主要活性。由于Orowan环和载荷转移与显著的应变硬化有关，这些结果解释了该合金优异的蠕变抗力，并为设计具有优异蠕变性能的沉淀强化合金提供了见解。
While precipitate-dislocation interactions are well-understood for Al-Cu alloys in tension, creep behavior has seen far less study. New, thermally-stabilized Al-Cu alloys have θ′ (Al2Cu) as strengthening precipitates that remain stable up to 300 °C (∼60% of the melting temperature) and higher, where creep becomes essential to the mechanical behavior. This investigation identifies the precipitate-dislocation interactions in such an Al-Cu alloy usingin-situneutron diffraction and scanning transmission electron microscopy. Significant load transfer to the θ′ precipitates occurs, which can be attributed to dislocation loops on the interfaces of θ′ and the Al matrix. Thus, Orowan looping is identified to be the primary activity for precipitate-dislocation interactions. As Orowan looping and load transfer are associated with significant strain hardening, these results explain the excellent creep resistance seen in this alloy, and provide insights into the design of precipitation strengthened alloys with superior creep performance.
铝中自扩散的示踪剂和核磁共振测量分析
DOI：
--
发表时间：
1971
期刊：
影响因子：
--
作者：
A. Seeger;D. Wolf;H. Mehrer
通讯作者：
H. Mehrer
有序析出物强化合金中的反相边界能和从剪切到循环的转变
DOI：
--
发表时间：
1988
期刊：
影响因子：
--
作者：
A. Ardell;J. Huang
通讯作者：
J. Huang