熱鍛對噴射成形7055-T6合金組織和性能的影響

熱鍛對噴射成形7055-T6合金組織和性能的影響Effects of forging on microstructure and mechanical properties of spray forming 7055-T6 alloy

以噴射成形7055-T6鋁合金為對象，借助萬能力學(xué)試驗機(jī)、電化學(xué)工作站、光學(xué)顯微鏡(OM)、掃描電鏡(SEM)、透射電鏡(TEM)等手段研究熱鍛對擠壓合金顯微組織與性能的影響。結(jié)果表明：擠壓合金的縱向抗拉強(qiáng)度為705 MPa，屈服強(qiáng)度為665 MPa，斷口形貌表現(xiàn)為沿晶斷裂，而鍛造后合金的抗拉強(qiáng)度、屈服強(qiáng)度分別下降了33 MPa和34 MPa，但伸長率、硬度和導(dǎo)電率均有所上升，斷口形貌表現(xiàn)為韌性斷裂；擠壓合金晶粒較均勻，組織有方向性，但熱鍛后合金部分晶粒長大合并，部分晶粒破碎；合金晶界析出相中的主要元素含量均比基體高，且熱鍛后合金晶界析出相中的Mg、Zn元素含量降低，Cu元素含量升高；合金經(jīng)峰值時效后，晶內(nèi)GP區(qū)和η′析出相為主，晶界析出相近似連續(xù)分布，導(dǎo)致合金耐蝕性不好；鍛造后晶界和晶內(nèi)析出相均長大粗化，使得合金強(qiáng)度下降，耐蝕性提高。

High strength 7055-T6 aluminum alloys were produced by spray forming. The microstructures and properties of alloy after forging and extrusion were investigated using tensile test, electrochemical workstation, optical microscope(OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM). The results indicate that the tensile strength of the extruded alloy can reach 705 MPa, the yield strength can reach to 665 MPa, and the extruded alloys exhibit an intergranular fracture, the tensile strength and yield strength of the forged alloy decrease by 33 MPa and 37 MPa, respectively, but the elongation, electrical conductivity and hardness all have increased, and the forged alloys exhibit a ductile fracture. The extruded alloys feature fine and homogeneous, the grains are elongated along extrusion, but some grains of forged alloys are broken, and some grains grow up; and the grain boundary precipitates of extruded alloys continuous distribution, the distribution of precipitated phases in grain boundary is dispersive and homogeneous, which leads to a bad corrosion resistance; the precipitated phases of forged alloys have coarsened, which reduce the strength properties but increase the corrosion–resistance.

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