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对1060工业纯铝分别进行室温轧制和深冷轧制,取成品厚度为300、200、100、50和25μm 5组试样进行拉伸试验。结果表明,经过室温轧制的轧件,当其厚度减薄至100μm时出现微尺寸效应,即厚度大于100μm时随厚度减小抗拉强度增大,厚度小于100μm时随厚度减小抗拉强度减小;发现100μm是纯铝室温轧制时出现尺寸效应的临界值。与室温轧制相比,经过深冷轧制轧件微尺寸效应的临界值相同而表现形式不同,厚度小于临界值100μm后其抗拉强度随厚度减小而增加的速度加快。在相同厚度条件下,深冷轧制后的轧件比室温轧制的晶粒内部亚结构更细小,分析认为这是其强度高于室温轧制的一个原因。
The 1060 industrial pure aluminum were respectively subjected to room temperature rolling and deep cold rolling. Tensile tests were carried out on five groups of samples with the thickness of 300,200,100,50 and 25μm. The results show that after rolling at room temperature, the micro-size effect occurs when the thickness is reduced to 100μm, that is, the tensile strength increases with the thickness when the thickness is greater than 100μm, and decreases with the thickness when the thickness is less than 100μm Decreases; found 100μm is the critical value of the size effect of pure aluminum rolling at room temperature. Compared with room temperature rolling, the micro-size effect of the cold-rolled steel has the same critical value and different forms. When the thickness is less than the critical value of 100 μm, the tensile strength increases with the decrease of the thickness. Under the same thickness condition, the rolled steel after cold rolling is finer than the internal structure of the grain rolled at room temperature, which is considered as one of the reasons why its strength is higher than room temperature rolling.