喷射成形7055铝合金的显微组织和力学性能

来源期刊:中国有色金属学报2007年第12期

论文作者:李先聚 杨杰 张豪 张捷 张荻

文章页码:1987 - 1992

关键词:7055铝合金;喷射成形;热处理;显微组织;力学性能

Key words:7055 Al alloy; spray forming; heat treatment; microstructure; mechanical properties

摘    要:采用全自动控制往复喷射成形工艺制备了7055铝合金的大规格喷射成形锭坯。通过显微组织分析和力学性能测试,研究工业规格喷射成形7055铝合金的初始组织、挤压工艺及热处理制度对显微组织和力学性能的影响。结果表明,喷射成形7055铝合金锭坯规格可达d 260 mm×1600 mm,晶粒为等轴状,粒度宏观均匀,主要在20~30 μm,组织无明显宏观偏析,锭坯致密度达到98.2 %。喷射成形态材料的T6态σb为500~543 MPa,显示控制往复喷射成形铝合金锭坯冶金质量优越。喷射成形锭坯经过小挤压比变形后达到全致密,大规格产品的T6态纵向σb提高到745 MPa,δ为12.8 %。

Abstract: A large-scale 7055 Al alloy billet with a size of d 260 mm×1600 mm was prepared by fully automatic controlled reciprocating spray forming technology. The initial microstructure and the effect of subsequent treatment (including extrusion and heat treatment) on the microstructures and mechanical properties of the 7055 alloy were studied. The results show that the as-deposited billet has an equiaxed and homogeneous structure with a grain size of 20~30 μm and no macro-segregation structure. The relative density of the as-deposited alloy gets up to 98.2%. The ultimate tensile strength of as-deposited materials after T6 heat treatment gets up to 500~543 MPa, which indicates that there is little defect in the as-deposited billets produced by fully automatic controlled reciprocating spray forming technology. After deformation at small extrusion ratio, the billets could be fully densified. The ultimate tensile strength of the large-scale materials at T6 state rises to 745 MPa, and the elongation is 12.8%.

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