Abstract—This paper examines manufacturability problems of a new Al–Ca–La–Mn alloy in the process of pressure treatment. Electron microscopy and X-ray diffraction analysis were used to perform a detailed study of the structure of the alloy in the cast state and after thermomechanical treatment under different conditions. The cast structure of the alloy is shown to consist of the Al-based solid solution (Al) and Al₄(Ca,La) eutectic phase, whose volume fraction is ~15%. The metallographic analysis of the alloys subjected to hot and cold rolling, as well as cold drawing, was performed; a substantial refining of eutectic intermetallics compared to that in the cast state was found. In particular, the homogeneous distribution of submicron spherical particles (300–500 nm in size) in the volume of composite material is observed, which are efficient stabilizers of the structure upon recrystallization. The obtained samples of rolled sheets demonstrate the high thermal stability of the structure and properties during long-term isothermal holding at 250 and 350°С. In particular, it has been shown that the 10-h annealing of cold-rolled sheet 1 mm thick at 250°С leads to a decrease in the hardness only by ~15%. The most favorable conditions for manufacturing the rolled sheets allow us to reach high mechanical properties (an ultimate strength of 240–290 MPa, a yield strength of 200–250 MPa, and a relative elongation of 5.5–15.5%).

摘要—本文研究了新型Al–Ca–La–Mn合金在压力处理过程中的可制造性问题。使用电子显微镜和X射线衍射分析对铸态和​​在不同条件下进行热机械处理后的合金结构进行了详细的研究。合金的铸造结构显示为由Al基固溶体（Al）和Al _4组成（Ca，La）共晶相，其体积分数约为15％。对进行了热轧和冷轧以及冷拔的合金进行了金相分析。与铸造状态相比，发现了共晶金属间化合物的大量提纯。尤其是，观察到复合材料体积中亚微米球形颗粒（尺寸为300-500 nm）的均匀分布，它们是重结晶时结构的有效稳定剂。所获得的轧制板样品显示出在250和350°C的长期等温保持过程中，结构和性能的高热稳定性。特别地，已经显示出在250℃下对1mm厚的冷轧板进行10小时的退火导致硬度仅降低〜15％。