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Formation of Amorphous and Nanocrystalline Ti-Cu-Ni Alloys by Mechanical Alloying

机译:机械合金化形成非晶态纳米晶Ti-Cu-Ni合金

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摘要

Amorphous and nanocrystalline powders of Ti_xCu_(90-x)Ni_(10) (x=20, 30, 40, 50 and 60 at. percent) have been synthesized by the mechanical alloying method under argon atmosphere. The mechanically alloyed powders show halo patterns in the X-ray diffraction patterns for 30<= x<= 60 and disordered fcc structures, with nanocrystalline grains for x=20. In the amorphous powders, the peak position of 2#theta# shifts to the low angle side almost linearly with increasing x. In particular, the amorphous phase is earlier formed with increasing x from 20 to 50. In the differential scanning calorimetry experiment, crystallization temperature and peak temperature increase linearly for 30<=x<60. The average particle size estimated by scanning electron microscopy is about 11 #mu#m for 30<=x<=60.
机译:Ti_xCu_(90-x)Ni_(10)(x = 20、30、40、50和60 at。%)的非晶态和纳米晶体粉末已通过在氩气气氛下的机械合金化方法合成。机械合金化的粉末在X射线衍射图中显示30 <= x <= 60和无序fcc结构的光晕图案,在x = 20时具有纳米晶粒。在无定形粉末中,随着x的增加,2#θ#的峰值位置几乎线性地移向低角度一侧。特别地,较早地形成非晶相,其中x从20增加到50。在差示扫描量热法实验中,结晶温度和峰值温度对于30 <= x <60线性增加。对于30 <= x <= 60,通过扫描电子显微镜估计的平均粒径为约11#μm。

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