Al-Sc-Zr-Er-Ti铝合金累积叠轧组织性能及织构研究

Microstructure,Properties and Texture of Al-Sc-Zr-Er-Ti Aluminum Alloy by Accumulative Roll Bonding

采用背散射电子衍射、X射线衍射、拉伸试验等手段研究了Al-Sc-Zr-Er-Ti铝合金室温累积叠轧过程中组织、性能与织构的变化。结果表明,累积叠轧使合金的大角度晶界比例提升,从而有效细化晶粒,4道次后合金超细晶粒平均晶粒尺寸达到0.83μm,晶粒组织也更加均匀。随着叠轧次数增加,整体织构强度增加,沿α取向线的Brass{110}<112>、沿β取向线的Copper{112}<111>和S{123}<634>轧制织构随累积叠轧循环道次增加而明显增加,最终成为主要织构。合金强度在1道次叠轧后显著升高,然后随叠轧道次增加缓慢增加,而延伸率随叠轧道次增加呈下降趋势。4道次后,试样抗拉强度达到216.88 MPa,屈服强度达到199.48 MPa,延伸率为4.48%。

The microstructure,properties and texture evolution of Al-Sc-Zr-Er-Ti alloy during accumulative roll bonding(ARB)were investigated by using electron back-Scatter diffraction,X-ray diffractometer,as well as tensile testing.The result shows that ARB can increase the proportion of high-angle grain boundary,effectively making the grain size finer.It is shown that the ultra-fine grains of the Al-Sc-Zr-Er-Ti alloy have an average grain size of 0.83μm and more uniform structure after 4 ARB cycles.By increasing the ARB cycles,the overall texture strength has been improved.The rolled textures,including Brass{110}<112>along theα-oriented line and Copper{112}<111>and S{123}<634>along theβ-oriented line are obviously increased with the increase of ARB cycles,and finally become the predominant textures.The alloy strength can increase significantly after one ARB cycle,and then increases slowly by further increasing the ARB cycles.The elongation is in a decline by increasing the ARB cycles.After 4 ARB cycles,the sample has the tensile strength of 216.88 MPa,the yield strength of 199.48 MPa and the elongation rate of 4.48%.