Deformation Behavior and Dynamic Recrystallization of Biomedical Co-Cr-W-Ni (L-605) Alloy
Deformation Behavior and Dynamic Recrystallization of Biomedical Co-Cr-W-Ni (L-605) Alloy
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DOI：
10.1007/s11661-012-1602-x
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发表时间：
2013-06-01
影响因子：
2.8
通讯作者：
Maire, Eric
中科院分区：
文献类型：
--
作者：
Favre, Julien;Koizumi, Yuichiro;Maire, Eric
通过高温压缩试验研究了Co-20Cr-15W-10Ni合金的力学行为。使用 SEM-EBSD 评估变形后的微观结构。在高温和低应变速率 [T > 1373 K (1100 A ℃)，应变速率 < 0.1 s(-1)] 和高应变速率（应变速率类似于 10 s(-1)）下，动态再结晶会发生显着的晶粒细化。动态再结晶是不连续的，通过晶界成核而发生，从而形成项链状结构。成核机制很可能是晶界的凸出。然而，再结晶也会通过退火孪晶的旋转而发生，退火孪晶也会膨胀。对观察到的机械行为进行建模可以对动态再结晶引起的流动软化进行合理的量化，表明动态再结晶随变形的进展。
The mechanical behavior of Co-20Cr-15W-10Ni alloy is studied by compression tests at high temperature. Microstructures after deformation are evaluated using SEM-EBSD. Significant grain refinement occurs by dynamic recrystallization for high temperatures and low strain rates [T > 1373 K (1100 A degrees C), strain rate < 0.1 s(-1)], and at high strain rates (strain rate similar to 10 s(-1)). Dynamic recrystallization is discontinuous and occurs by nucleation of grain boundaries, leading to a necklace-like structure. The nucleation mechanism is most likely bulging of grain boundaries. However, recrystallization occurs also by rotation of annealing twins, which can bulge as well. Modeling of the observed mechanical behavior gives a fair quantification of flow softening due to dynamic recrystallization, indicating the progress of dynamic recrystallization with deformation.