Microstructures and mechanical properties of TiAl joint brazed with Ti-Mn-Fe-Ni-Zr system medium-entropy filler alloy

IF 2.4 4区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Welding in the World Pub Date : 2024-05-25 DOI:10.1007/s40194-024-01785-7

Zhiliang Zhai, Xinyu Ren, Yonglai Shang, Yaoyong Cheng, Haishui Ren, Huaping Xiong, Yongjuan Jing

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Abstract

A five-element medium-entropy filler alloy with composition of Ti-(18 ~ 24)Mn-(12 ~ 18)Fe-(3 ~ 8)Ni-(3 ~ 8)Zr (wt.%) was proposed for vacuum brazing of TiAl-based alloy. The filler alloy was mainly composed of Ti-based solid solution and Ti-(Fe, Mn) compound dissolved with elements of Ni and Zr. The filler alloy ingot was ground into powder and then the filler powder was preset into the V-shaped groove butt joint with a gap of 50 μm. The Ti-Mn-Fe-Ni-Zr brazing alloy showed the liquidus temperature of 1060.1 °C, and also presented excellent wettability on TiAl substrate at 1110 °C for 10 min. The brazed joint mainly consisted of γ-TiAl, α₂-Ti₃Al, and residual brazing filler reaction phase. The brazing condition of 1210 °C/45 min exhibited the maximum joint thickness of 308 μm and the maximum area percentage of γ-TiAl phase of 33.77%, with almost elimination of residual brazing filler reaction phase within the joint, and meanwhile offered the maximum room-temperature tensile strength of 418 MPa, 70.85% of the base alloy. The joint fracture showed a mixed mode of intergranular and transgranular fracture.

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用 Ti-Mn-Fe-Ni-Zr 系中熵填充合金钎焊的 TiAl 接头的微观结构和力学性能

提出了一种用于 TiAl 基合金真空钎焊的五元素中熵填充合金，其成分为 Ti-(18 ~ 24)Mn-(12 ~ 18)Fe-(3 ~ 8)Ni-(3 ~ 8)Zr (重量百分比)。填充合金主要由 Ti 基固溶体和溶解有 Ni 和 Zr 元素的 Ti-（Fe、Mn）化合物组成。将填料合金铸锭研磨成粉末，然后将填料粉末预置到间隙为 50 μm 的 V 形凹槽对接接头中。钛-锰-铁-镍-锆钎焊合金的液相温度为 1060.1 °C，在 1110 °C、10 分钟的温度条件下，在钛铝基底上呈现出极佳的润湿性。钎焊接头主要由 γ-TiAl、α2-Ti3Al 和残余钎料反应相组成。在 1210 °C/45 min 的钎焊条件下，接头的最大厚度为 308 μm，γ-TiAl 相的最大面积百分比为 33.77%，接头内残余的钎焊填料反应相几乎消失，同时室温抗拉强度最大为 418 MPa，是基合金的 70.85%。接头断裂表现出晶间断裂和跨晶断裂的混合模式。

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来源期刊

Welding in the World METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

4.20

自引率

14.30%

发文量

181

审稿时长

6-12 weeks

期刊介绍： The journal Welding in the World publishes authoritative papers on every aspect of materials joining, including welding, brazing, soldering, cutting, thermal spraying and allied joining and fabrication techniques.