Ding Jinhua, Wang Chao, Lu Cheng, Zhu Guangming, Guo Nana, Gao Xujie, Wang Xin, Cui Chunxiang
School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, China.
School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China.
Materials (Basel). 2023 Jul 27;16(15):5264. doi: 10.3390/ma16155264.
The grain size plays a pivotal role in determining the properties of the alloy. The grain size can be significantly decreased by adding inoculants. Aiming to address the shortcomings of existing inoculants, the AlTi-AlO/Al inoculant was successfully prepared using Al-Ti master alloy and AlO whiskers as raw materials. With the aid of ultrasonic energy, the AlO whiskers were uniformly dispersed within the inoculants. Under the combined action of ultrasonic and titanium, the AlO whiskers were broken into small particles at high temperature. To enhance the morphology of AlTi and achieve even particle dispersion throughout the matrix, vacuum rapid quenching treatment was applied to the inoculant. The SEM test results indicated a significant reduction in particle size after vacuum rapid quenching. The AlTi-AlO/Al inoculants exhibited excellent grain refinement effects on the weldable Al-Cu-Mn alloy. Crystallographic calculations and HRTEM analysis revealed that AlO and Al have orientation relationships, indicating their potential as effective heterogeneous nucleation sites. The mechanical properties of the Al-Cu-Mn alloy were obviously improved after the AlTi-AlO/Al inoculant was added.
晶粒尺寸在决定合金性能方面起着关键作用。通过添加孕育剂可显著减小晶粒尺寸。为解决现有孕育剂的缺点，以Al-Ti中间合金和AlO晶须为原料成功制备了AlTi-AlO/Al孕育剂。借助超声能量，AlO晶须均匀分散在孕育剂中。在超声和钛的共同作用下，AlO晶须在高温下破碎成小颗粒。为改善AlTi的形态并使颗粒在整个基体中均匀分散，对孕育剂进行了真空快速淬火处理。扫描电子显微镜（SEM）测试结果表明真空快速淬火后颗粒尺寸显著减小。AlTi-AlO/Al孕育剂对可焊接Al-Cu-Mn合金表现出优异的细化晶粒效果。晶体学计算和高分辨率透射电子显微镜（HRTEM）分析表明AlO和Al具有取向关系，表明它们作为有效异质形核位点的潜力。添加AlTi-AlO/Al孕育剂后，Al-Cu-Mn合金的力学性能明显改善。
