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Mechanically induced phase transformations of the sigma phase of nanograined and of coarse-grained near-equiatomic FeCr alloys

机译:纳米晶粒和粗晶粒近等原子FeCr合金sigma相的机械诱导相变

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摘要

A coarse-grained tetragonal sigma phase [sigma]-Fe0.54Cr0.46, prepared from an as-cast alloy, and a nanocrystalline [sigma]-Fe0.52Cr0.48 phase were ball-milled in argon in a Fritsch P0 ball-mill at different vibration amplitudes. X-ray diffraction evidences solely a gradual transformation of the sigma phases into bcc phases. Room-temperature Mössbauer spectroscopy shows further the presence of a non-magnetic phase which remains non-magnetic at least down to 35 K. It is attributed to an amorphous phase whose formation is favoured at grain boundaries by oxygen in such milling conditions. Possible explanations of the different final structures reported in the literature in high-energy ball-milled near-equiatomic Fe-Cr alloys are discussed.
机译:将由铸态合金制备的粗晶四方σ-Fe0.54Cr0.46相和纳米晶σ-Fe0.52Cr0.48相在氩气中在Fritsch P0球磨机中球磨。在不同的振动幅度下磨。 X射线衍射仅证明sigma相逐渐转变为bcc相。室温Mössbauer光谱进一步显示了非磁性相的存在,该非磁性相至少在35 K以下仍保持非磁性。这归因于无定形相,在这种研磨条件下,氧在晶界处有利于形成。讨论了文献中报道的高能球磨近等原子Fe-Cr合金中不同最终结构的可能解释。

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