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采用扫描电镜、显微硬度计及万能试验机研究了挤压速度对双通道等径角挤压对7003铝合金力学性能的影响。结果表明:在任一挤压速度下,随着挤压道次的增加,材料的力学性能明显改善;挤压一道次后试样的抗拉强度由338.3 MPa提高到384.5 MPa,二道次后提高到431.5 MPa;屈服强度经一道次挤压后由260 MPa提高到325 MPa,二道次后提高到426 MPa,二道次涨幅更明显;随着挤压速度的增大,试样断后伸长率的变化总体上均呈现下降的趋势。当挤压速度为25 mm/min时,一道次挤压后伸长率最小;经二道次挤压后的显微硬度,在挤压速度为25 mm/min时由原样退火态的73.5 HV0.02提高到136.4 HV0.02,且强度以及显微硬度均在挤压速度为25~35 mm/min时达到了最大值。
The effect of extrusion speed on the mechanical properties of 7003 aluminum alloy was investigated by means of scanning electron microscopy, microhardness tester and universal testing machine. The results show that the mechanical properties of the material are obviously improved with the increase of the extrusion pass at any extrusion speed. The tensile strength of the sample increases from 338.3 MPa to 384.5 MPa after one pass, and increases after two passes To 431.5 MPa; the yield strength increased from 260 MPa to 325 MPa after one pass and 426 MPa after two passes, and the second pass increased more obviously; with the increase of extrusion speed, the elongation at break Rate changes generally show a downward trend. When the extrusion speed is 25 mm / min, the elongation after a single extrusion is the smallest. The microhardness after two passes is 73.5 HV0 when the extrusion speed is 25 mm / min .02 increased to 136.4 HV0.02, and the strength and microhardness reached the maximum value at the extrusion speed of 25-35 mm / min.