Unusual hardening behaviour in heavily cryo-rolled Cu-Al-Zn alloys during annealing treatment
Unusual hardening behaviour in heavily cryo-rolled Cu-Al-Zn alloys during annealing treatment
复制标题
退火处理期间深冷轧制 Cu-Al-Zn 合金的异常硬化行为
DOI：
10.1016/j.msea.2016.02.060
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发表时间：
2016-04-06
期刊：
影响因子：
6.4
通讯作者：
Zhu, X. K.
中科院分区：
文献类型：
--
作者：
Gong, Y. L.;Ren, S. Y.;Zhu, X. K.
在液氮温度下通过轧制制备了三种纳米Cu-Al-Zn合金。然后将变形的Cu合金在150-300摄氏度下退火1小时。具有高溶质含量并因此具有低堆垛层错能的两种合金表现出不寻常的退火硬化，即在150和200 ℃退火后硬度和强度增加，拉伸伸长率降低。从X射线衍射（XRD）分析和透射电子显微镜（TEM）的显微组织观察，发现在200 ℃退火后，由于位错的恢复，微观应变和位错密度降低，并且由于溶质偏析，晶格参数降低。同时，两种Cu合金的孪晶密度增加，晶粒尺寸基本保持不变。结果表明，退火孪晶和层错的形成以及溶质原子的偏聚可能是异常退火硬化的主要原因。(C)2016爱思唯尔B. V.保留所有权利。
Three nanostructured Cu-Al-Zn alloys were produced via rolling at the liquid nitrogen temperature. The deformed Cu alloys were then annealed at 150-300 degrees C for 1 h. The two alloys with high solute content and thus with low stacking fault energy exhibit unusual annealing hardening, namely, an increase in hardness and strength and a decrease in tensile elongation after annealing at 150 and 200 degrees C. From X-ray diffraction (XRD) analysis and microstructural observations by transmission electron microscopy (TEM), it is found that microstrain and dislocation density decrease after annealing at 200 degrees C because of the recovery of dislocations and the lattice parameter decreases due to solute segregation. Meanwhile, the twin density of the two Cu alloys increases and grain size remains basically unchanged. It is shown that the formation of annealing twins and stacking faults and the segregation of solute atoms may be the main causes of unusual annealing hardening. (C) 2016 Elsevier B.V. All rights reserved.