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Development of Al–Mg–Si alloy performance by addition of grain refiner Al–5Ti–1B alloy
Science Progress ( IF 2.1 ) Pub Date : 2021-06-30 , DOI: 10.1177/00368504211029469
Khaled Abd El-Aziz 1 , Emad M Ahmed 2 , Abdulaziz H Alghtani 1 , Bassem F Felemban 1 , Hafiz T Ali 1 , Mona Megahed 3 , Dalia Saber 4
Affiliation  

Aluminum alloys are the most essential part of all shaped castings manufactured, mainly in the automotive, food industry, and structural applications. There is little consensus as to the precise relationship between grain size after grain refinement and corrosion resistance; conflicting conclusions have been published showing that reduced grain size can decrease or increase corrosion resistance. The effect of Al–5Ti–1B grain refiner (GR alloy) with different percentages on the mechanical properties and corrosion behavior of Aluminum-magnesium-silicon alloy (Al–Mg–Si) was studied. The average grain size is determined according to the E112ASTM standard. The compressive test specimens were made as per ASTM: E8/E8M-16 standard to get their compressive properties. The bulk hardness using Vickers hardness testing machine at a load of 50 g. Electrochemical corrosion tests were carried out in 3.5 % NaCl solution using Autolab Potentiostat/Galvanostat (PGSTAT 30).The grain size of the Al–Mg–Si alloy was reduced from 82 to 46 µm by the addition of GR alloy. The morphology of α-Al dendrites changes from coarse dendritic structure to fine equiaxed grains due to the addition of GR alloy and segregation of Ti, which controls the growth of primary α-Al. In addition, the mechanical properties of the Al–Mg–Si alloy were improved by GR alloy addition. GR alloy addition to Al–Mg–Si alloy produced fine-grained structure and better hardness and compressive strength. The addition of GR alloy did not reveal any marked improvements in the corrosion properties of Al–Mg–Si alloy.



中文翻译:

添加晶粒细化剂 Al-5Ti-1B 合金提高 Al-Mg-Si 合金性能

铝合金是所有成型铸件中最重要的组成部分,主要用于汽车、食品工业和结构应用。对于晶粒细化后的晶粒尺寸与耐蚀性之间的精确关系,目前还没有达成共识;已发表的相互矛盾的结论表明,减小晶粒尺寸会降低或提高耐腐蚀性。研究了不同含量的Al-5Ti-1B晶粒细化剂(GR合金)对铝镁硅合金(Al-Mg-Si)力学性能和腐蚀行为的影响。平均晶粒尺寸根据E112ASTM标准测定。压缩测试样本是根据 ASTM: E8/E8M-16 标准制作的,以获得其压缩性能。体积硬度采用维氏硬度计在载荷50g下测定。使用 Autolab 恒电位仪/恒电流仪 (PGSTAT 30) 在 3.5% NaCl 溶液中进行电化学腐蚀测试。通过添加 GR 合金,Al-Mg-Si 合金的晶粒尺寸从 82 µm 减小到 46 µm。由于GR合金的添加和Ti的偏析控制了初生α-Al的生长,α-Al枝晶的形貌由粗大的枝晶结构转变为细小的等轴晶。此外,GR合金的添加提高了Al-Mg-Si合金的机械性能。Al-Mg-Si 合金中添加 GR 合金可产生细晶粒结构以及更好的硬度和抗压强度。添加GR合金并没有显示出Al-Mg-Si合金的腐蚀性能有任何显着改善。

更新日期:2021-07-01
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