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Fabrication of Ni_3Al thin foil by cold-rolling

机译：冷轧制备Ni_3Al薄箔

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摘要

Thin foils of stoichiometric Ni_3A1 with thicknesses ranging from 57 to 315 #mu#m were successfully fabricated by heavily cold-rolling without intermediate annealing. Starting materials were produced by directional solidification using the floating zone method. The total reduction in thickness obtained was as much as 95.5 percent. This high rolling ductility is considered to be due to the mono-crystalline or near monocrystalline form of the starting materials. X-ray pole figures showed the formation of {110} rolling texture. This {110} texture is considered to develop mainly as a result of compressive deformation normal to the rolling plane. The foils recrystallized at temperatures over 1273 K had some tensile ductility (3.0-14.6 percent) at room temperature in air, in contrast to the usual brittleness of polycrystalline Ni_3Al. Electron back scatter diffraction measurements revealed that low angle and #SIGMA#3 coincidence site lattice boundaries, which are considered to be crack-resistant, comprised 41-84 percent of the total grain boundary area in the recrystallized foils. This large fraction is probably a chief cause of the observed ductility. These results demonstrate that it may be possible to utilize Ni_3Al thin foils as lightweight, high-temperature structural materials, e.g. honeycomb structures.
机译：通过重冷轧而没有中间退火，成功地制造了化学计量的Ni_3A1薄箔，其厚度在57到315＃μm之间。使用浮动区方法通过定向凝固生产原材料。所获得的总厚度减少高达95.5％。这种高的延展性被认为是由于原料的单晶或接近单晶形式。 X射线极图显示{110}滚动织构的形成。该{110}织构被认为主要由于垂直于轧制平面的压缩变形而发展。与多晶Ni_3Al的通常脆性相反，在高于1273 K的温度下重结晶的箔在室温下于空气中具有一定的拉伸延展性（3.0-14.6％）。电子背散射衍射测量表明，低角度和＃SIGMA＃3重合点晶格边界被认为是抗裂的，占重结晶箔片总晶界面积的41-84％。很大一部分可能是观察到的延展性的主要原因。这些结果表明，有可能利用Ni_3Al薄箔作为轻质的高温结构材料，例如铝。蜂窝结构。

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