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首页> 外文期刊>Journal of Materials Engineering and Performance >Simultaneous Achievement of High Strength and Superior Ductility in an As-Rolled Cu-30Zn Brass
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Simultaneous Achievement of High Strength and Superior Ductility in an As-Rolled Cu-30Zn Brass

机译：同时实现高强度和轧制CU-30ZN黄铜中的高强度和卓越的延展性

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摘要

Strength and ductility are the two most essential properties for copper alloys which are commonly used as structural materials. However, these properties are often mutually exclusive and seldom improved simultaneously in the samples fabricated through plastic deformation. For example, room temperature rolling (RTR) samples with a large deformation amount usually exhibit high strength but poor ductility. The present study provides an effective strategy for obtaining satisfactory mechanical properties in a Cu-30Zn brass. Compared with RTR sample with a large deformation amount (90%), a desired and outstanding combination of high strength and superior ductility can be achieved in a low deformation (70%) sample fabricated through ultra-low temperature rolling (UTR). The average tensile strength of 90% deformation RTR sample is 641.7 MPa, whereas that of 70% deformation UTR sample is 695.4 MPa. The average elongation of the 90% deformation RTR sample is only 3.7%. By contrast, the average elongation of 70% deformation UTR sample is 7.2%. In the meantime, the average yield strength of 70% deformation UTR sample is higher than that of 90% deformation RTR sample, which are 598.2 and 561.7 MPa, respectively. Large proportions of ultrafine grains and nanometer-scale deformation twins are responsible for the excellent mechanical properties of 70% deformation UTR sample. This effective method is vital for industry production to simultaneously obtain high strength and superior ductility in Cu-30Zn brass and may be also suitable for other copper alloys.
机译：强度和延展性是铜合金的两种最基本的性能，其通常用作结构材料。然而，这些性质通常是相互排斥的，并且在通过塑性变形制造的样品中同时互动。例如，具有大变形量的室温轧制（RTR）样品通常表现出高强度但延展性差。本研究提供了在Cu-30zn黄铜中获得令人满意的机械性能的有效策略。与具有大变形量（90％）的RTR样品相比，通过超低温度轧制（UTR）制造的低变形（70％）样品，可以实现高强度和优异延展性的所需和突出组合。 90％变形RTR样品的平均拉伸强度为641.7MPa，而70％变形UTR样品的抗拉率样品为695.4MPa。 90％变形Rtr样品的平均伸长率仅为3.7％。相比之下，70％变形UTR样品的平均伸长率为7.2％。同时，70％变形UTR样品的平均屈服强度高于90％变形Rtr样品，分别为598.2和561.7MPa。大量的超细晶粒和纳米尺度变形双胞胎负责70％变形UTR样品的优异机械性能。这种有效的方法对于工业生产至关重要，同时获得Cu-30zn黄铜中的高强度和卓越的延展性，并且也可以适用于其他铜合金。

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