Effects of Ru content on phase transformation and compression property of cast TiAl alloys

Jie-ren Yang; Zi-xiang Jiao; Dong-dong Zhu; Yu-lun Wu; Zi-tong Gao; Rui Hu

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Effects of Ru content on phase transformation and compression property of cast TiAl alloys

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Ruthenium(Ru)is a promising element to heighten the comprehensive mechanical properties of TiAl alloys.In the present study,the phase transformation during the cooling of Ti-47Al-2Cr-2Nb-xRu(x=0,0.1,0.5,1.0,at.%)alloys was investigated.The results show that Ru tends to segregate in the interdendritic region during solidification,and therefore,refines the as-cast microstructure of the alloys.As aβ-stabilizer,Ru does not induce a novel solidification reaction but maintains the peritectic reaction of L+β→α.An excessive Ru content would cause the formation of(γ+τ1+B2)and(α+γ+τ1+B2)phase regions below 1,250°C.The precipitation ofτ1-containing mixture is attributed to the Ru-segregation,which inhibits the reaction ofα→γand facilitates the formation of B2 phase.The discontinuous coarsening ofγphase and blockτ1 phase formed alternately in a manner of analogous eutectoid decomposition within B2 phase.In addition,the effect of Ru content on compression property of the alloys was studied.The yield strength increases up to 427 MPa at 800°C with the addition of 1.0at.%Ru,which is mainly due to the solution strengthening effect of Ru.

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《中国铸造：英文版》 |2020年第6期|393-401|共9页
作者
Jie-ren Yang; Zi-xiang Jiao; Dong-dong Zhu; Yu-lun Wu; Zi-tong Gao; Rui Hu;
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作者单位

State Key Laboratory of Solidification Processing;

Northwestern Polytechnical University;

Xi'an 710072;

China;

Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment;

Northwestern Polytechnical University;

Xi'an 710072;

China;

School of Mechanical Engineering&Key Laboratory of Air-driven Equipment Technology of Zhejiang Province;

Quzhou University;

Quzhou 324000;

China;

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原文格式 PDF
正文语种 chi
中图分类 TG146.23;
关键词
TiAl alloy; solidification path; microstructure; phase transformation; yield strength;

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Effects of Ru content on phase transformation and compression property of cast TiAl alloys

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