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首页> 外文期刊>Physica, B. Condensed Matter >Magnetism and structure of Fe-Cu binary solid solutions obtained by high-energy ball milling
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Magnetism and structure of Fe-Cu binary solid solutions obtained by high-energy ball milling

机译：高能球磨得到的Fe-Cu二元固溶体的磁性和结构

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Martensitic phase transformation is found in various metals, alloys, ceramics and even biological systems. This paper reports on the Fe segregated anomalous alpha-gamma martensitic transformation observed in FexCu100-x binary solid solutions (x = 25 and 50) after subsequent heating-cooling processes. A characteristic observable feature of a martensitic transformation is the microstructure it produces, thermal hysteresis, evolution and metastability. We have analysed the microstructure using neutron thermo-diffraction experiments up to 1100 K. The structural changes of the Fe segregated phase, from bcc to fcc crystal structures, have been followed in detail. The most relevant feature is that the onset of martensite transformation is observed, on heating, more than 100 K below the expected temperature for pure bec-Fe (1183 K), while the reverse transformation occurs below 900 K on cooling. This anomalous behaviour for the alpha-gamma transformation depends on sample composition, being more important for low Fe contents. Besides that, magnetisation vs. temperature measurements show a clear correlation with structure changes, thus exhibiting thermal hysteresis on heating-cooling cycles. Moreover, a magnetisation enhancement above 550K is observed on heating, this fact can be attributed to thermal-induced ferromagnetism on isolated gamma-Fe precipitates via strong magheto-volume coupling. (c) 2006 Elsevier B.V. All rights reserved.
机译：马氏体相变存在于各种金属，合金，陶瓷甚至生物系统中。本文报道了在随后的加热冷却过程之后，在FexCu100-x二元固溶体（x = 25和50）中观察到的Fe分离的异常α-γ马氏体转变。马氏体转变的一个可观察到的特征是它产生的微观结构，热滞后，演变和亚稳。我们使用中子热衍射实验分析了高达1100 K的微观结构。详细研究了Fe偏析相的结构变化，从bcc到fcc晶体结构。最相关的特征是，加热时观察到马氏体转变的开始，比纯bec-Fe（1183 K）的预期温度低100 K以上，而在冷却时低于900 K则发生逆相变。 α-γ转换的这种异常行为取决于样品组成，对于低铁含量更重要。除此之外，磁化与温度的测量结果显示出与结构变化的明显相关性，因此在加热-冷却循环中表现出热滞现象。此外，加热时可观察到550K以上的磁化强度增强，这一事实可归因于通过强磁强-体积耦合在孤立的γ-Fe析出物上产生的热感应铁磁。 （c）2006 Elsevier B.V.保留所有权利。

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