Preparation of Refractory Metal Silicide(Mo1-xNbx)5Si3 Alloy and Its Microstructure and Properties

Chen Hui1; Ma Qin1; Shi Shaoyu1

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Preparation of Refractory Metal Silicide(Mo_1-xNb_x)₅Si₃ Alloy and Its Microstructure and Properties
Vol. 29, Issue 5, Pages: 399-401(2009)
Published： 2009 ，
DOI：

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[1]陈辉,马勤,石少玉.难熔(Mo_(1-x),Nb_x)_5Si_3合金的制备与组织性能[J].特种铸造及有色合金,2009,29(05):399-401+385.

Chen Hui1, Ma Qin1, Shi Shaoyu1. Preparation of Refractory Metal Silicide(Mo_1-xNb_x)₅Si₃ Alloy and Its Microstructure and Properties. [J]. Special Casting & Nonferrous Alloys 29(5):399-401(2009)
[1]陈辉,马勤,石少玉.难熔(Mo_(1-x),Nb_x)_5Si_3合金的制备与组织性能[J].特种铸造及有色合金,2009,29(05):399-401+385. DOI：

Chen Hui1, Ma Qin1, Shi Shaoyu1. Preparation of Refractory Metal Silicide(Mo_1-xNb_x)₅Si₃ Alloy and Its Microstructure and Properties. [J]. Special Casting & Nonferrous Alloys 29(5):399-401(2009) DOI：

摘要

为改善Mo5Si3的本征脆性

采用电弧熔炼/高温退火技术制备了（Mo1-x

Nbx）5Si3（x=0

0.2

0.4

0.6

0.8

1.0）合金

并结合X射线衍射（XRD）、扫描电子显微镜（SEM）、能谱仪（EDS）、显微硬度计等分析设备

对合金试样进行了分析测试。结果表明

Mo有助于高温相β-Nb5Si3的稳定;合金更倾向形成（Mo

Nb）5Si3及β-（Nb

Mo）5Si3固溶体

能谱分析表明有少量Mo3Nb2Si3三元相生成;Nb在Mo5Si3中的固溶度远大于在MoSi2中的固溶度;随Nb含量的增加

合金硬度呈现先增高后降低的抛物线规律

最高硬度（HV）达1616.7

试样退火后的硬度高于退火前的硬度;压痕断裂韧度较低

合金韧性没有明显改善。

Abstract

In order to improve the brittleness of Mo5Si3 alloy

（Mo1-x

Nbx）5Si3（x=0

0.2

0.4

0.6

0.8

1）alloy was prepared by electric arc melting and annealed at 1200℃ for 50h.Microstructure and properties of the alloy were investigated by XRD（X-ray diffraction）

SEM（scanning electron microscope）and EDS as well as micro-hardness tester.The results reveal that Mo element can improve the stability of β-Nb5Si3 phase.EDS analysis shows that the alloy is composed of（Mo

Nb）5Si3 and β-（Nb

Mo）5Si3 solid solution with a little Mo3Nb2Si3 ternary intermetallics.The solubility of Nb in Mo5Si3 is much higher than that in MoSi2.With increasing in Nb content

the hardness of the alloy is firstly increased and then decreased

showing parabolic curves

and the maximum hardness of HV1616.7 can be observed.In addition

the hardness of the alloy annealed is higher than that without annealed.The indentation fracture toughness of the alloy has not been improved significantly.

关键词

Mo5Si3金属硅化物(MoNb)5Si3固溶体Mo3Nb2Si3

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