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首页> 外文期刊>Materials Science and Engineering >Effect of Nb, Zr and Zr + Hf on the microstructure and mechanical properties of β-solidifying γ-TiAl alloys
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Effect of Nb, Zr and Zr + Hf on the microstructure and mechanical properties of β-solidifying γ-TiAl alloys

机译：Nb，Zr和Zr + Hf对β-固体γγ合金微观结构和力学性能的影响

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摘要

The present work has been devoted to study of β-solidifying γ-TiAl alloys based on Ti-44Al-0.2B and doped with Nb, Zr and Zr + Hf. The phase transformation sequences were established for the alloys. On this basis, upset forging followed by heat treatment was performed that resulted in formation of near the same duplex type microstructures in the alloys. Tensile tests in the temperature range of 20-900 °C and creep tests at 700 °C were carried out for the alloys in the duplex conditions. The alloys doped with Zr and Zr + Hf showed appreciably higher strength, higher temperatures of the brittle-ductile transition (BDT) and enhanced creep resistance while retaining near the same ductility below the BDT temperatures as compared to the Nb-containing alloy. Enhanced creep resistance and higher temperatures of the BDT in the alloys doped with Zr and Zr + Hf in contrast to the Nb-containing alloy were attributed to higher solid solution hardening due to larger atomic radii of Zr and Hf versus Nb and to different partitioning behaviors of Zr and Zr + Hf versus Nb leading to higher concentrations in the γ phase of Zr and Zr + Hf in the Zr- and (Zr + Hf)-containing alloys in contrast to that of Nb in the Nb-containing alloy. Both of these factors contributed to lower diffusivity (especially in γ grains) in the alloys doped with Zr and Zr + Hf. In particular, alloying with Zr and Zr + Hf shifted the development of dynamic recrystallization processes towards high temperatures that slowed down the increase of ductility with increasing the test temperature in the BDT range and led to higher BDT temperatures.
机译：本作本作研究了基于Ti-44Al-0.2b的β-固体γ-Tial合金的研究，并掺杂有Nb，Zr和Zr + Hf。为合金建立相变序列。在此基础上，进行镦锻锻造，然后进行热处理，导致在合金中形成接近相同的双链型微结构。在双相条件下的合金中对20-900℃的温度范围和700℃的蠕变试验进行拉伸试验。掺杂有Zr和Zr + HF的合金显着提高强度，脆性延性过渡（BDT）的较高温度，并增强了抗蠕变性，同时保持与含Nb的合金相比在BDT温度下方的相同延展性附近。与含Nb的合金相比，掺杂有Zr和Zr + Hf的合金中BDT的增强抗蠕变性和较高温度归因于Zr和Hf与Nb的较大原子半径和不同的分配行为，归因于较高的固体溶液硬化。 Zr和Zr + Hf与Nb相比，Zr-和（Zr + HF）在含Nb合金中的Nb的γ和（Zr + HF）中的γ相和Zr + HF中γ相的浓度较高。这两种因素都有助于掺杂有Zr和Zr + HF的合金中的较低扩散率（特别是γ颗粒）。特别地，用Zr和Zr + HF的合金化转移了动态再结晶过程的发育，朝向高温的高温，随着BDT范围内的测试温度提高了测试温度并导致了更高的BDT温度。

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