(湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082)
摘 要: 研究單級(jí)固溶及峰值時(shí)效處理對(duì)多層噴射沉積7090/SiCp復(fù)合材料顯微組織及室溫力學(xué)性能的影響，觀察了擠壓態(tài)、固溶及時(shí)效處理后的顯微組織，并對(duì)其進(jìn)行力學(xué)性能測試。結(jié)果表明：擠壓態(tài)復(fù)合材料的晶粒均勻細(xì)小，基體合金中存在大量的第二相顆粒，為富銅相及MgZn2相；經(jīng)過固溶處理后，復(fù)合材料的晶粒尺寸約為 3 μm，第二相顆粒明顯減少，溶入基體合金中；采用
關(guān)鍵字: 高強(qiáng)鋁合金；多層噴射沉積；熱處理；SiCp；顯微組織；力學(xué)性能
（College of Materials and Engineering, Hunan University, Changsha 410082, China）
Abstract:The effect of solid solution and peak ageing on the microstructures and ambient mechanical properties of multi-layer spray deposited 7090/SiCp composite was studied, and the microstructures of as-extruded, solid solution and ageing treatments were investigated, and the tensile properties of different stages were tested. The results show that fine and homogeneous grain structure is obtained in as-extruded composites, there are a large amount of Cu-rich particles and MgZn2 in the matrix. The grains size is about 3 μm after solid solution treatments, the precipitate particles of the second phases decrease obviously and solute into the matrix alloy. The ultimate tensile strength of the composites following solid solution treated at 475 ℃ for 1 h is 610 MPa, and the tensile strength of the composites aged at 120 ℃ for 24 h is 765 MPa.
Key words: high strength aluminum alloy; multi-layer spray deposition; heat treatment; SiCp; microstructure; mechanical properties
