Property Responses in Nb-Si-Hf-Ti-Al-W-B-Cr Alloys for High-Temperature Applications

被引：2

作者：

Yang, Xiuxia ^{[1
]}

Sha, Jiangbo ^{[1
]}

Zhang, Hu ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

PRICM 7, PTS 1-3 | 2010年 / 654-656卷

关键词：

Nb-Si alloys; Lavers Cr(2)Nb; high-temperature strength; fracture toughness; oxidation resistance; FRACTURE-TOUGHNESS; COMPOSITES; ENGINES;

D O I：

10.4028/www.scientific.net/MSF.654-656.468

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Multi-component Nb-(11,15)Si-5Hf-30Ti-4Al-4W-2B-(8,16)Cr alloys have been proposed, attempting to obtain the Nb-Si based alloys with a comprehensive property. The results show that three phases of Nbss, Nb(5)Si(3) and Laves Cr(2)Nb exist in the alloys with a Cr content of 16 at%. With increasing Si and Cr contents the fracture toughness K(Q) decreases, while the oxidation resistance at 1250 degrees C and strength at 1250 degrees C and 1350 degrees C exhibit an increasing tendency. The 15Si-16Cr alloy shows the highest strength and oxidation resistance, and the lowest toughness; they are 385MPa at 1350 degrees C, 215mg/cm(2) at 1250 degrees C for 100 h, and 5.45 MPa.m(1/2) at room temperature, respectively. The 11Si-8Cr alloy with an Nb(SS)/Nb(5)Si(3) microstructure only has the highest toughness of 11.87 MPa.m(1/2), its strength and oxidation resistance are the lowest.

引用

页码：468 / 471

页数：4

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