Mechanically alloyed (MA) oxide dispersion strengthened (ODS) IN9052 Al alloy exhibits excellent strength both at ambient and high temperatures (up to 300 °C). The limited ductility at ambient temperatures, stemming primarily from the inherent microstructure, impede its practical appeal in structural applications. The present study signifies a maiden effort to additively manufacture MA-ODS IN9052 alloy using solid-state additive friction stir deposition (AFSD) process which has added advantages of uniform particle dispersion, severe particle breakdown, and a recrystallized microstructure. This study indicates a remarkable transition from the initial strain softening behavior in the as received alloy to significant work hardening in the AFSD condition, while maintaining satisfactory yield strength of ∼380 MPa at ambient temperature highlighting a favorable strength-ductility synergy. Importantly, exceptional thermal stability has been achieved in the AFSD alloy by systematically optimizing the process parameters to engineer microstructural heterogeneity. The AFSD alloy demonstrated an impressive high temperature strength, with ∼22 % and ∼49 % increase in yield strength as compared to forged alloy at 240 °C and 340 °C, respectively. Enhancing high temperature strength in aluminum alloys has been a long standing goal and the current results outperform other commercially available high temperature Al alloys. Excellent thermal stability in the AFSD processed alloy is attributed to the nano-scale carbon-rich cluster formation around oxides and carbides in the matrix. These particles restrict grain boundary sliding and are more effective in dislocation-particle interaction. The findings are supported by detailed TEM and atom probe tomography analysis.

中文翻译：

---

增强添加剂搅拌摩擦沉积 ODS IN9052 铝合金的热稳定性


机械合金化 (MA) 氧化物弥散强化 (ODS) IN9052 铝合金在环境温度和高温（高达 300 °C）下均表现出优异的强度。主要源于固有的微观结构，在环境温度下的延展性有限，阻碍了其在结构应用中的实际吸引力。本研究首次采用固态增材搅拌摩擦沉积（AFSD）工艺增材制造MA-ODS IN9052合金，该工艺具有颗粒分散均匀、颗粒破碎严重和再结晶微观结构的优点。这项研究表明，从原始合金的初始应变软化行为到 AFSD 条件下的显着加工硬化，同时在环境温度下保持令人满意的屈服强度 ∼380 MPa，突出了良好的强度-延展性协同作用。重要的是，通过系统地优化工艺参数以设计微观结构的不均匀性，AFSD 合金实现了卓越的热稳定性。 AFSD 合金表现出令人印象深刻的高温强度，与 240 °C 和 340 °C 的锻造合金相比，屈服强度分别提高了 22% 和 49%。提高铝合金的高温强度一直是一个长期目标，目前的结果优于其他商用高温铝合金。 AFSD 加工合金的优异热稳定性归因于基体中氧化物和碳化物周围形成的纳米级富碳簇。这些颗粒限制晶界滑动并且在位错-颗粒相互作用中更有效。这些发现得到了详细的 TEM 和原子探针断层扫描分析的支持。