Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第17卷    第12期    总第105期    2007年12月

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文章编号:1004-0609(2007)12-1987-06
喷射成形7055铝合金的显微组织和力学性能
李先聚,杨 杰,张 豪,张 捷,张 荻

(上海交通大学 金属基复合材料国家重点实验室,上海 200030)

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T6σb500~543 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 MPaδ12.8 %

 

关键字: 7055铝合金;喷射成形;热处理;显微组织;力学性能

Microstructure and mechanical properties of 7055 Al alloys by spray forming
LI Xian-ju, YANG Jie, ZHANG Hao, ZHANG Jie, ZHANG Di

State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200030,China

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%.

 

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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