摘要
采用铸锭冶金法制备了Al-0.9Mg-0.6Si-0.7Cu合金,通过电导率测试、显微组织观察、力学性能测试、XRD物相分析以及α(Al)基体点阵常数的计算等方法研究了固溶温度(525~570℃)对该合金微观组织、力学性能和断口形貌的影响。结果表明,实验合金最佳的固溶时效工艺为555℃×45 min固溶水淬,185℃×5.5 h时效;在此条件下,合金的抗拉强度、屈服强度、伸长率和电导率分别为396 MPa、377 MPa、19.5%和38.9%IACS。XRD物相分析表明,合金主要由α-Al基体和Mg2Si等合显微组成;通过基体点阵常数的精确计算,能较好地表征合金的固溶程度。固溶处理后残留的析出相粒子和再结晶程度是影响合金拉伸断口形貌的主要因素。
Al-0.9Mg-0.6Si-0.7Cu alloy was produced by ingot-metallurgy method.Effects of solution temperatures(525-570 ℃) on microstructure,mechanical properties and fracture morphology of the Al-0.9Mg-0.6Si-0.7Cu alloy were investigated by the electric conductivity measurement,optical microscopy,tensile testing,X-ray diffraction phase analysis and calculation of lattice parameter of α(Al) matrix.The results show that the optimum heat-treatment process of the alloy is solution-treated at 555 ℃ for 45 min,quenched and then aged at 185 ℃ for 5.5 h.Under this condition,the tensile strength,yield strength,elongation and electric conductivity of the alloy can reach 396 MPa,377 MPa,19.5% and 38.9 % IACS,respectively.The results of XRD show that the alloy is mainly composed of α-Al matrix and Mg2 Si phase.And the accurate calculation on the lattice parameter of the α(Al) matrix can characterize the solution degree of the alloy effectively.It is found that the tensile fracture morphology is mainly affected by the volume fraction of residual particles and recrystallization level of deformed grains for the tested alloy.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2014年第12期56-61,共6页
Transactions of Materials and Heat Treatment
基金
教育部科学技术研究重大项目(311025)
