Effects of Thermal Exposure on Microstructure and Properties of Nb-22.5Cr-0.12MgO Alloy

Xie Zhirong; Xu Xiang; Li Jun; Peng Cuncai; Deng Liping; Lu Shiqiang

doi:10.15980/j.tzzz.2020.12.025

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Effects of Thermal Exposure on Microstructure and Properties of Nb-22.5Cr-0.12MgO Alloy
Vol. 40, Issue 12, Pages: 1428-1431(2020)
Published： 2020 ，
DOI： 10.15980/j.tzzz.2020.12.025

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[1]谢志荣,许翔,李俊,彭存财,邓莉萍,鲁世强.热暴露对Nb-22.5Cr-0.12MgO组织及性能的影响[J].特种铸造及有色合金,2020,40(12):1428-1431.

Xie Zhirong, Xu Xiang, Li Jun, et al. Effects of Thermal Exposure on Microstructure and Properties of Nb-22.5Cr-0.12MgO Alloy. [J]. Special Casting & Nonferrous Alloys 40(12):1428-1431(2020)
[1]谢志荣,许翔,李俊,彭存财,邓莉萍,鲁世强.热暴露对Nb-22.5Cr-0.12MgO组织及性能的影响[J].特种铸造及有色合金,2020,40(12):1428-1431. DOI： 10.15980/j.tzzz.2020.12.025.

Xie Zhirong, Xu Xiang, Li Jun, et al. Effects of Thermal Exposure on Microstructure and Properties of Nb-22.5Cr-0.12MgO Alloy. [J]. Special Casting & Nonferrous Alloys 40(12):1428-1431(2020) DOI： 10.15980/j.tzzz.2020.12.025.

摘要

对机械合金化+热压制备的Nb-22.5Cr-0.12MgO合金在1 200℃下分别进行了30和50 h的热暴露

研究了热暴露对其组织及性能的影响。结果表明

Nb-22.5Cr-0.12MgO合金由Nb固溶体和细小、均匀分布的Laves相NbCr

构成;热暴露过程中

合金的物相稳定

室温韧性良好

但压缩强度明显下降

在1 200℃热暴露50 h后

其室温压缩强度下降至2 655 MPa

相对于热暴露前降低了18.5%

合金的热稳定性较差。

Abstract

The effects of thermal exposure on microstructure and properties of the Nb-22.5 Cr-0.12 MgO alloys prepared by mechanical alloying and hot pressing were investigated by thermally exposed at 1 200 ℃ for 30 h and 50 h

respectively. The results reveal that the Nb-22.5 Cr-0.12 MgO alloy is composed of Nb solid solution and fine Laves phase NbCr

with uniform distribution. During the thermal exposure process

the alloy can remain steady phase constituent and excellent room-temperature fracture toughness.After thermal exposure at 1 200 ℃ for 50 h

the compressive strength is decreased to 2 655 MPa

which is reduced by 18.5% compared to unexposed ones

thus the alloy possesses poor thermal stability.