【摘要】 本文在室温下对铸态3003铝合金实施了道次等效应变约为0.5的等通道转角变形(Equal-channel angular pressing-ECAP),对其夹杂物的碎化、分布和合金的硬度进行了考察。结果表明,第1道次的ECAP加工将合金内部的粗大(长5-15μm、宽1-2μm)且几乎呈连续分布的夹杂物(AlFe(Mn)Si)折断碎化(长1-3μm)并初步分散开,引入大量位错至合金中,提高硬度幅度达66.7%。后续的2-4道ECAP加工将夹杂物分散均匀,但对夹杂物的碎化和硬度影响很小。本文的试验结果说明了ECAP作为一种细化铝合金内部AlFe(Mn)Si夹杂物并使之分布均匀的工艺方法的可行性。更多还原

【Abstract】 Equal channel angular pressing(ECAP) of 3003Al alloy ingot has been performed at room temperature,with an imposed equivalent strain of ~0.5 for single pass,and the refinement/distribution of inclusions and the hardness of the alloy were examined.The results show that the first pass of ECAP refined the inclusions(AlFe(Mn)Si) of the alloy considerably,with the size variation from 5-15μm in length,1-2μm in width to 1-3μm in length,1-2μm in width.In addition to the refinement,the first pass of ECAP improved significantly the distribution of the AlFe(Mn)Si inclusions,and introduced high density of dislocations leading the hardness to increase ~66.7 %.With increasing ECAP passes,the uniformity of the distribution of AlFe(Mn)Si inclusions was improved,the sizes of the inclusions and the hardness of the alloy kept almost unchanged.The present results demonstrate the possibility of ECAP as an effective tool to refine AlFe(Mn)Si inclusions of aluminum alloys.更多还原