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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.4; Jul 7-11, 2003; Leganes, Madrid, Spain >Effect of backpressure on the structure and properties of Al-based alloys processed by ECAP
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Effect of backpressure on the structure and properties of Al-based alloys processed by ECAP

机译：背压对ECAP处理的铝基合金组织和性能的影响

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摘要

An ultrafine-grained (UFG) microstructure was obtained in a bulk billets 20x20x80mm out of Al-based alloys by Equal Channel Angular Pressing (ECAP) at the ambient temperature with a different number of passes and backpressure levels. In brittle cast non-heat treatable Al-5wt%Fe supersaturated solid solution of iron in an aluminium matrix was processed during 16 passes of ECAP with backpressure 275 MPa. Strength, ductility and microhardness of the ECAP alloy were significantly enhanced. An increase in a backpressure retards cracking of intermetallic particles and enhances workability and ductility of ECAP alloys. The room strength and microhardness of initially course-grained AA5083 alloy, subjected to ECAP with backpressure 20 MPa, are much higher than its standard values after conventional processing.
机译：在环境温度下，通过不同道次和背压水平，通过等通道角挤压（ECAP），在20x20x80mm的铝基散装坯料中获得了超细晶粒（UFG）的显微组织。在ECAP 16次通过背压275 MPa的过程中，对脆性铸造的不可热处理的Al-5wt％Fe的铁在铝基体中的过饱和固溶体进行了处理。 ECAP合金的强度，延展性和显微硬度得到显着提高。背压的增加会延迟金属间化合物的裂纹并增强ECAP合金的可加工性和延展性。初始过程晶粒AA5083合金的室温强度和显微硬度在ECAP下承受20 MPa的背压，远高于常规工艺后的标准值。

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