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首页> 外文会议>Recent developments in the processing and applications of structural metals and alloys >Consolidation of Amorphous Aluminum Alloy Powder by Equal Channel Angular Extrusion
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Consolidation of Amorphous Aluminum Alloy Powder by Equal Channel Angular Extrusion

机译：等通道角挤压固形非晶态铝合金粉末

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Semi-amorphous aluminum alloy powders produced by gas atomization were compacted using equal channel angular extrusion (ECAE) in the temperature range of 200-300℃. Microstructures of the compacts were studied after different levels of ECAE deformation, which allowed analysis of the mechanism of particle interactions, deformation and bonding during different stages of consolidation. Very non-homogeneous deformation of the compacted material was detected. At the temperatures of compaction, amorphous powder particles were much softer than fully crystalline powder particles, and they were severely deformed while the crystalline particles remained nearly spherical. Almost full consolidation occurred in regions predominantly consisting of amorphous and semi-amorphous powder particles at true strains of ～2. However, further excessive deformation led to strain localization and shear crack formation in the consolidated regions. Regions dominated by fully crystalline spherical particles with brittle intermetallic phases showed poor consolidation due to particle rotations and particle fracture; leading to weak particle bonding. The results show that consolidation is impeded by the presence of fully crystalline particles in the powder.
机译：在200-300℃的温度范围内，使用等通道角挤压（ECAE）压制通过气体雾化生产的半非晶铝合金粉末。在不同水平的ECAE变形后研究了压坯的微观结构，从而分析了固结不同阶段的颗粒相互作用，变形和结合的机理。检测到压实材料的非常不均匀的变形。在压实温度下，无定形粉末颗粒比完全结晶的粉末颗粒软得多，并且它们严重变形，而结晶颗粒保持接近球形。几乎完全固结发生在主要由非晶和半非晶粉末颗粒组成的区域，真实应变约为2。然而，进一步的过度变形导致在固结区域中应变局部化和剪切裂纹形成。具有脆性金属间相的全结晶球形颗粒占主导的区域由于颗粒旋转和颗粒破裂而显示出较差的固结。导致粒子键合较弱。结果表明，粉末中存在全结晶颗粒会阻碍固结。

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