通过拉伸力学性能、微观组织观察、X射线衍射物相分析及品格常数精确测量等方法,研究固溶-单级时效处理条件对7B04合金组织和性能的影响.实验结果表明:采用合适的固溶-时效温度和时间,能使合金的力学性能得到明显的改善,经过470℃×60 min+120℃×24 h处理后,合金的拉伸性能分别达到σ_b=568 MPa,σ_(0.2)=542 MPa,δ=12%;通过XRD衍射物相分析及α(Al)基体晶格常数的精确测量,能更好地表征溶质相的回溶以及时效后第二相的析出程度,指导合金固溶-时效热处理制度的选择.
The effect of the solution-single aging treatment on the structure and properties of the 7B04 alloy was studied by tensile test, microstructures observation, XRD phase analysis and lattice parameter test etc. The results show that the mechanical properties of the alloy are improved conspicuously by adopting proper time and temperature of solution-aging treatment. After 470℃×60 min+120℃×24 h treatment, the tensile properties of the alloy obtained:σ_b=568 MPa,σ_(0.2)=542 MPa, δ=12%. Using X-ray diffraction (XRD) analysis and accurate measuring on the lattice parameter of the α (A1) matrix, we can characterize the redissolving of the solute phase and the level of precipitation of the second-phase after aging. It can give us guidance of choosing a suitable solution-aging treatment for the alloy.
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