以低成本、易变形的Ti-42Al-5Mn合金(原子分数，%)为研究对象，利用DSC、EPMA、EBSD及Pandat热力学计算软件系统研究了W含量(0.5%~1.0%)对合金相变行为和组织的影响。结果表明，随着W含量由0.5%提高至1.0%，合金β单相区开始温度(T_β )和γ相溶解温度(T_γ-solv)几乎未发生变化，而共析转变温度(T_eut)稍有增加。W添加会在一定程度上影响合金固态相变路线，随着W含量增加至0.5%，合金近服役温度下的平衡相由α₂ + γ + Laves逐渐演变为β_o + α₂ + γ + Laves。W添加会对合金片层组织特征产生显著影响。在(γ + α + β)三相区处理时，随着W含量的提高，合金缓冷后组织中片层含量显著降低，当W含量为0.8%和1.0%时，合金组织以γ晶粒和β_o相为主，几乎消除了α₂/γ层片组织。在(α + β)两相区处理时，合金缓冷后均为近片层组织，且随着W含量由0.5%提高至1.0%，片层组织晶团得到明显细化。

Advanced intermetallic β-solidifying γ-TiAl-based alloys have various potential applications in the aerospace and automobile industries due to their low density, functionality at higher temperatures, and high specific strength/modulus. The crucial aspect that needs to be considered when developing a new β-solidifying γ-TiAl alloy is to clarify the influence law of β-stabilizer elements on the phase transformation behavior of γ-TiAl alloys. In this work, the impact of W contents (0.5%-1.0%, atomic fraction) on the phase transformation behavior and microstructure characteristics of Ti-42Al-5Mn-xW (atomic fraction) alloy with low cost and superior temperature workability was systematically investigated. The findings demonstrate that there were minor changes in the β-phase single region temperature (T_β ) and γ phase solvus temperature (T_γ-solv); furthermore, the eutectoid reaction temperature (T_eut) increases with the W content from 0.5% to 1.0%. Addition of W influences the solid phase transformation pathway to a certain extent. When the concentration of W increases to 0.5%, the equilibrium phase of the alloy at near service temperature gradually changes from α₂ + γ + Laves to β_o + α₂ + γ + Laves. Additionally, W addition will also have a substantial effect on the lamellar microstructure. The volume fraction of lamellar microstructure considerably decreased after alloying with (0.5%-1.0%)W for Ti-42Al-5Mn alloy when being treated in the (γ + α + β) triple-phase region followed by furnace cooling. Increasing the W content to 0.8% and 1.0% results in the development of γ and β_o grain phases with almost complete removal of α₂/γ lamellar structures. However, the W-free and W-bearing Ti-42Al-5Mn alloys show near complete lamellar structures when treated in (α + β) two-phase region followed by furnace cooling. Furthermore, when the content of W increased from 0.5% to 1.0%, an equiaxed grain structure with refined lamellar colonies is typically obtained.