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首页> 外文期刊>Materials Science and Engineering >Achieving an exceptional ductility at room temperature in a low SFE copper alloy fabricated by severe plastic deformation
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Achieving an exceptional ductility at room temperature in a low SFE copper alloy fabricated by severe plastic deformation

机译：通过严重塑性变形制造的低SFE铜合金在室温下实现卓越的延展性

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摘要

Low stacking fault energy alloys often exhibit low ductility. However, sometimes these alloys show unusual mechanical behavior following specific processing parameters. In this study, a low stacking fault energy α+β brass was processed by equal channel angular pressing (ECAP) at 350 °C in 'route C through three passes. Room temperature tensile testing showed that ductility, surprisingly, reached ～80%, whilst good tensile strength was maintained. Investigation of alloy microstructure revealed a combination of deformation mechanisms, including slip and twinning, accompanied by grain boundary serration and grain fragmentation. It is suggested that these deformation modes triggered these unexpected mechanical properties in this intrinsically brittle alloy. The required energy for discontinuous recrystallization was supplied after only one pass in the a phase, and three passes in the β phase, which then prompted good ductility. In order to study texture evolution, the macro-texture was measured. A high fraction of recrystallized grains and change in strain path fostered the development of Goss, Rotated Goss and Rotated Cube components in the a phase. While in the β phase {011}<111> and Goss components were dominant. Despite the high Schmid factor, Hall-Petch effects and work hardening led to increase of strength and hardness after the final pass.
机译：低堆叠故障能量合金通常表现出低延展性。然而，有时这些合金可以在具体处理参数后显示出不寻常的机械行为。在该研究中，通过在350°C的“途径C至3次通过”中，通过在350°C的等电气角压（ECAP）处理低堆叠故障能量α+β黄铜。室温拉伸检测显示延展性，令人惊讶的是，达到〜80％，而保持良好的拉伸强度。对合金微观结构的研究显示了变形机制的组合，包括滑动和孪生，伴随着晶界锯齿和晶粒碎片。建议这些变形模式在本内在脆性合金中引发了这些意外的机械性能。在一个相中仅一次通过后，提供用于不连续重结晶的所需能量，并且在β相中进行三次通过，然后促进良好的延展性。为了研究纹理演化，测量宏观纹理。高分重结晶的晶粒和应变路径的变化培养了在阶段中的高空，旋转的高空和旋转立方体组分的发展。虽然在β相{011} <111>和高斯组分中占主导地位。尽管施密因素高，霍尔 - 展示效果和工作硬化导致最终通过后的力量和硬度的增加。

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