(湖南大学 材料科学与工程学院，长沙 410082)
摘 要:
基于多道次局部小变形累积致整体成型的工艺思路，采用一种新型的楔形压制工艺，对大尺寸Al-Fe-V-Si耐热铝合金喷射沉积管坯进行有效致密化，压制出尺寸为douter
关键字: 耐热铝合金；多层喷射沉积；管坯；楔形压制；致密化；力学性能
（College of Materials Science and Engineering, Hunan University, Changsha 410082,China）
Abstract:A new wedge pressing process for compressing large scale porous tubular preforms was adopted based on the idea of accumulating local small deformation as to integral forming. Heat-resistant aluminum alloy tubes of douter 330 mm×dinner 314 mm×78 mm and douter 330 mm×dinner 312 mm×113 mm with well mechanical properties, density and good contour were fabricated. Densification behavior, microstructure and mechanical properties of the spray deposited Al-Fe-V-Si tubes during wedge pressing were investigated. The results show that, with increasing hydrostatic pressure and uniformly distributed temperature, the fragile interfaces and lamellar structure in the as-deposited materials are effectively improved, pores are closed and the mechanical properties are substantially upgraded due to increasing effective loading area after the stainless steel package wedge pressing. The mechanical properties and relative density of the deposits increase from 125 MPa, 0.15% and 82% to 301 MPa, 9.3% and 99.3% respectively after the reduction of 50.4%, indicating that the novel method is feasible, practical and cost-effective.
Key words: heat-resistant aluminum alloy; multi-layer spray deposition; tubular perform; wedge pressing; densification; mechanical properties
