固溶处理对TiB_(2)/7050Al复合材料组织与性能的影响

Effect of solution treatment on microstructure and properties of TiB_(2) /7050Al composite

研究了固溶处理对TiB_(2)/7050Al复合材料组织与性能的影响规律。结果表明,TiB_(2)/7050Al复合材料内的可溶性第二相主要为MgZn2(η相)、AlZnMgCu(T相)和Al2CuMg(S相)。η相在470℃已完全溶解,T相在476℃开始溶解,S相在491℃下可完全溶解。随固溶温度的升高,复合材料的强度整体呈上升趋势,但伸长率先增加后降低。在480℃固溶时,复合材料同时具备高强度和高塑性,其屈服强度、抗拉强度和伸长率分别为658 MPa、719 MPa和11.3%;继续升高固溶温度至490℃,虽然可使铝基体内残余S相完全溶解,但也使基体再结晶晶粒异常长大,降低了复合材料的塑性。

Effect of solution treatment on microstructure and properties of TiB_(2)/7050Al composite was studied.The results show that the soluble phases in the TiB_(2)/7050Al composite are mainly MgZn2(ηphase),AlZnMgCu(T phase)and Al2CuMg(S phase).Theηphase can dissolve completely below 470℃.The T phase begins to dissolve at 476℃,and the S phase can dissolve completely at 491℃.With the increase of solution treatment temperature,the strength of the composite increases,but the elongation increases firstly and then decreases.When solution treated at 480℃,the composite has both high strength and high plasticity,with its yield strength,tensile strength and elongation being 658 MPa,719 MPa and 11.3%,respectively.Further increasing the solution treatment temperature to 490℃,though the residual S phase completely dissolves in the Al matrix,but the elevated temperature promotes the recrystallized grains to grow abnormally,inducing low plasticity of the composite.