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Improvement of microstructure and fracture toughness of MASC alloy by element substitution of Zr for Hf
Journal of Alloys and Compounds ( IF 6.2 ) Pub Date : 2021-09-25 , DOI: 10.1016/j.jallcom.2021.162127
Qi Wang 1 , Xiaowei Wang 1 , Ruirun Chen 1 , Zhecheng Zhou 1 , Yanqing Su 1 , Hengzhi Fu 1
Affiliation  

To improve microstructure and fracture toughness of MASC alloy, the effects of element substitution of Zr for Hf on the microstructure and room-temperature fracture toughness in Nb-24.7Ti-16Si-xHf-yZr-2.0Cr-1.9Al (x + y = 8.2) alloys have been investigated in this study. The results show that the substitution of Zr for Hf in MASC alloy promotes the eutectic reaction of (Nb, X)3Si phase → Nbss/γ(Nb, X)5Si3 eutectic, and shifts the eutectic point to higher Si content, which leads the microstructure transformation from hypereutectic structure to nearly eutectic structure. The primary γ(Nb, X)5Si3 phase content decreases and Nbss phase content increases with the increase of Zr content. The room-temperature fracture toughness increases with the increase of Zr content, and the room-temperature fracture toughness values of 4Zr-4.2Hf, 6Zr-2.2Hf and 8.2Zr-0Hf alloys are 16.03–16.29 MPa m1/2. The room-temperature fracture toughness value of 16.29 MPa m1/2 is the highest value in the nondirectionally solidified Nb-Si based alloys.



中文翻译:

Zr替代Hf改善MASC合金的显微组织和断裂韧性

为了提高组织与MASC合金的断裂韧性,为的Hf的Zr元素取代在铌24.7Ti-16Si-微观结构和室温断裂韧性的效果X HF- ý的Zr-2.0Cr-1.9Al(X  +  y  = 8.2) 合金已在本研究中进行了研究。结果表明,MASC合金中Zr取代Hf促进了(Nb, X) 3 Si相→Nbss/γ(Nb, X) 5 Si 3共晶的共晶反应,并使共晶点向更高的Si含量移动,这导致微观结构从过共晶组织转变为近共晶组织。初级γ(Nb, X) 5 Si 3随着Zr含量的增加,相含量减少,Nbss相含量增加。室温断裂韧性随着Zr含量的增加而增加,4Zr-4.2Hf、6Zr-2.2Hf和8.2Zr-0Hf合金的室温断裂韧性值为16.03~16.29 MPa m 1/2。16.29 MPa m 1/2的室温断裂韧性值是非定向凝固 Nb-Si 基合金中的最高值。

更新日期:2021-10-02
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