Alshammari Yousef, Mendoza Shaira, Yang Fei, Bolzoni Leandro
School of Engineering, The University of Waikato, Private Bag 3105, Hamilton 3240, New Zealand.
College of Engineering, International University of Science and Technology in Kuwait, Mohamad Bin Qasim Street, Ardiya 92400, Kuwait.
Materials (Basel). 2023 Jul 10;16(14):4917. doi: 10.3390/ma16144917.
Titanium alloys are the ideal material for a wide range of structural applications, but their high cost compared to other metals hinders their adoption. Powder metallurgy and cheap alloying elements can be used to create new Ti alloys. In this study, the simultaneous addition of Al and Mn is considered to manufacture and characterise ternary Ti-2.5Al-Mn alloys obtained via pressing and sintering by varying the Mn content (1-10 wt.%). It is found that the addition of the alloying elements reduces compressibility. Consequently, the amount of porosity increases (8.5 → 10.8%) with the amount of Mn as the alloys were processed under the same conditions. The progressive addition of Mn refines the classical lamellar microstructure and, eventually, transforms it into an equiaxed β-grain structure with acicular α grains. The microstructural changes lead to continuous increases in strength (ultimate tensile strength: 694 → 851 MPa) and hardness (225 → 325 HV30) with an associated loss of ductility (elongation to failure: 13.9 → 1.0%). However, the obtained ternary Ti-2.5Al-Mn alloys have similar or better overall mechanical behaviour than most of the binary Ti-Mn alloys obtained through a variety of manufacturing methods.
钛合金是广泛用于结构应用的理想材料，但其与其他金属相比成本较高，这阻碍了它们的应用。粉末冶金和廉价合金元素可用于制造新型钛合金。在本研究中，考虑同时添加铝和锰，通过改变锰含量（1-10 wt.%），制造并表征通过压制和烧结获得的三元Ti-2.5Al-Mn合金。发现添加合金元素会降低可压缩性。因此，在相同条件下加工合金时，随着锰含量增加，孔隙率增加（8.5→10.8%）。逐步添加锰会细化经典的片状微观结构，并最终将其转变为具有针状α晶粒的等轴β晶粒结构。微观结构变化导致强度（极限抗拉强度：694→851 MPa）和硬度（225→325 HV30）持续增加，同时伴随着延展性损失（断裂伸长率：13.9→1.0%）。然而，所获得的三元Ti-2.5Al-Mn合金的整体力学性能与通过各种制造方法获得的大多数二元Ti-Mn合金相似或更好。
