为了消除重力铸造ZL401铝合金管坯中的孔洞、疏松等缺陷，改善其组织并提高力学性能，对其进行楔形压制（最大变形量为40％），并对其微观组织、力学性能和拉伸断口进行了研究。结果表明：楔形压制能明显压合甚至消除重力铸造产生的孔洞和疏松，随变形程度增大，其强度和伸长率均增大，抗拉强度、伸长率和相对密度分别从从楔压前的161MPa，3．3％，94．3%提高到232MPa，7．2％，99．5%；断裂方式由脆性断裂向韧性断裂转变。
In order to eliminate the pores and porosity in the gravity casted ZL401 aluminum alloy tube blank and improve the microstructure and increase the mechanical properties of the alloy, a wedge pressing（the maxmum deformation was 40 %）process was performed on the alloy and the microstructure, mechanical property and tensile fracture were studied. The results show that the wedge pressing process could obviously eliminate the pores and porosity generated during gravity casting and the strength and elongation increased with the increase of deformation. The tensile strength, elongation and relative density increased from 161 MPa, 3.3%, 94. 3% before wedge pressing to 232 MPa, 7.2 %, 99. 5 %. The fracture mode changed form brittle fracture to ductile fracture.
参考文献
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