Raji Sadiq Abiola, Popoola Abimbola Patricia Idowu, Pityana Sisa Leslie, Popoola Olawale Muhammed
Department of Chemical, Metallurgical and Materials Engineering, Tshwane University of Technology, Staatsartillerie Road, Pretoria West, Pretoria, South Africa.
Department of Metallurgical Engineering, Yaba College of Technology, P.M.B. 2011 Yaba, Lagos, Nigeria.
Heliyon. 2020 Jul 22;6(7):e04463. doi: 10.1016/j.heliyon.2020.e04463. eCollection 2020 Jul.
The high strength-to-weight ratio property of titanium aluminide (TiAl) based intermetallic alloys makes researchers regard this type of material as a potential replacement for the heavier superalloys of nickel. These alloys have been applied as turbocharger wheels of automobile and turbine blades of aircraft engines. A much recent alloy type of TiAl called the TNM alloy has emerged and primarily amenable to mechanical working; while providing the best combinations of mechanical properties that could be achieved through manufacturing processes with subsequent heat treatments. This is attained by solidifying entirely through the disordered β-phase (A2 structure). Effects of major alloying elements such as strength improvement, microstructural stability and phase formation demand the understanding of these alloying elements addition in TiAl-based intermetallic alloys. This review paper aims at encapsulating several works regarding the effects of major alloying elements on β-solidifying TiAl-based alloys and summarizing the characteristic effects of Si for these types of alloys. An impetus for future works on these types of intermetallic TiAl-based alloys is also presented.
铝化钛（TiAl）基金属间合金的高强度重量比特性使研究人员将这类材料视为重型镍基高温合金的潜在替代品。这些合金已被用作汽车涡轮增压器叶轮和飞机发动机涡轮叶片。一种名为TNM合金的新型TiAl合金最近出现了，它主要适合机械加工；同时提供了通过制造工艺和后续热处理所能实现的最佳机械性能组合。这是通过完全在无序β相（A2结构）中凝固来实现的。主要合金元素对强度提高、微观结构稳定性和相形成的影响需要了解这些合金元素在TiAl基金属间合金中的添加情况。这篇综述文章旨在总结关于主要合金元素对β凝固TiAl基合金影响的多项研究，并概述硅对这类合金的特性影响。还提出了对这类TiAl基金属间合金未来研究工作的推动因素。
