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Evolution of deformation and recrystallization textures in high-purity Ni and the Ni-5 at. pct W alloy

机译:高纯Ni和Ni-5 at处变形和再结晶织构的演变。 pct W合金

摘要

An attempt has been made to study the evolution of texture in high-purity Ni and Ni-5 at. pct W alloy prepared by the powder metallurgy route followed by heavy cold rolling (∼95 pct deformation) and recrystallization. The deformation textures of the two materials are of typical pure metal or Cu-type texture. Cube-oriented ({001} {100}) regions are present in the deformed state as long thin bands, elongated in the rolling direction (RD). These bands are characterized by a high orientation gradient inside, which is a result of the rotation of the cube-oriented cells around the RD toward the RD-rotated cube ({013} {100}). Low-temperature annealing produces a weak cube texture along with the {013} {100} component, with the latter being much stronger in high-purity Ni than in the Ni-W alloy. At higher temperatures, the cube texture is strengthened considerably in the Ni-W alloy; however, the cube volume fraction in high-purity Ni is significantly lower because of the retention of the {013} {100} component. The difference in the relative strengths of the cube, and the {013} {100} components in the two materials is evident from the beginning of recrystallization in which more {013} {100} -oriented grains than near cube grains form in high-purity Ni. The preferential nucleation of the near cube and the {013} {100} grains in these materials seems to be a result of the high orientation gradients associated with the cube bands that offer a favorable environment for early nucleation.
机译:已尝试研究高纯Ni和Ni-5 at下的织构演变。通过粉末冶金法制备的pct W合金,然后进行重冷轧(变形约95 pct)并重结晶。两种材料的变形织构为典型的纯金属或Cu型织构。立方取向的({001} {100})区域在变形状态下以沿滚动方向(RD)伸长的长细带存在。这些带的特征在于内部的高定向梯度,这是立方体定向的单元围绕RD向RD旋转的立方体({013} {100})旋转的结果。低温退火会与{013} {100}组分一起产生弱的立方织构,后者在高纯度Ni中比在Ni-W合金中强得多。在较高的温度下,Ni-W合金中的立方织构明显增强;然而,由于{013} {100}组分的保留,高纯度Ni中的立方体体积分数明显较低。从重结晶开始就可以明显看出两种材料中立方体和{013} {100}组分的相对强度的差异,其中在高重结晶中形成的{013} {100}取向晶粒比接近立方体的晶粒更多纯度Ni。这些材料中近立方和{013} {100}晶粒的优先成核似乎是与立方带相关的高取向梯度的结果,该梯度为早期成核提供了有利的环境。

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