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首页> 外文期刊>Journal of Materials Science >Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al-Si alloy
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Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al-Si alloy

机译：铸态亚共晶Al-Si合金严重变形过程中的应变路径和组织演变

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摘要

Microstructure evolution in an as-cast Na modified Al-7%Si (wt. pct.) alloy was examined during redundant and monotonic straining by repetitive equi-channel angular pressing (ECAP) under ambient temperature conditions, and during friction stir processing (FSP). Redundant straining during repetitive ECAP was accomplished by processing following route B_C while monotonic straining employed route A. Single- and multi-pass FSP was conducted on this same as-cast material using an FSP tool having a threaded pin. The as-cast microstructure comprises equiaxed primary α dendrite cells embedded in the Al-Si eutectic constituent. The evolution of this microstructure during repetitive ECAP can be described by idealized models of this process. The primary and eutectic constituents can still be discerned and the Si particle distribution is not homogenized even during ambient temperature processing involving von Mises strains >9.0. In contrast, the primary and eutectic constituents cannot be distinguished in the stir zone after even a single FSP pass. Strain estimates based on the shape change of the primary α constituent indicate that the Si particle distribution has become homogeneous at local von Mises strains of 2.5-3.0 during the FSP thermomechanical cycle. Mechanical property data are consistent with strain path during SPD processing by repetitive ECAP and FSP.
机译：在环境温度条件下，通过重复等通道角挤压（ECAP），在重复的单调应变过程中，检查了铸态Na改性的Al-7％Si（wt。pct。）铸态合金的微观组织演变。 ）。重复ECAP期间的冗余应变是通过遵循路径B_C进行处理而进行的，而单调应变则是通过路径A进行的。使用具有螺纹销的FSP工具在相同铸态材料上进行单次和多次通过FSP。铸态组织包括嵌入Al-Si共晶成分中的等轴初级α枝晶细胞。可以通过该过程的理想化模型描述重复ECAP期间这种微观结构的演变。即使在涉及von Mises应变> 9.0的环境温度处理过程中，仍可以识别主要成分和低共熔成分，并且Si颗粒分布也不均匀。相反，即使经过一次FSP处理，也无法在搅拌区区分主要成分和共晶成分。基于主要α成分的形状变化的应变估计表明，在FSP热机械循环中，硅颗粒分布在2.5-3.0的局部von Mises应变下变得均匀。力学性能数据与重复ECAP和FSP在SPD处理过程中的应变路径一致。

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