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NiAl-Cr(Mo)和 NiAl-Cr(Mo)-4Fe 共晶合金组织 的高温稳定性研究
High Temperature Stability of Microstructure of NiAl-Cr(Mo) and NiAl-Cr(Mo)-4Fe Eutectic Alloys
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- DOI:
- 作者:
- 吕永飞，康胜峰，王 雷
LYU Yongfei, KANG Shengfeng, WANG Lei
- 作者单位:
- 西安理工大学 材料科学与工程学院，陕西 西安 710048
School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China
- 关键词:
- 共晶合金；高温稳定性；热处理
eutectic alloy; high temperature stability; heat treatment
- 摘要:
- 将 NiAl-Cr(Mo)和 NiAl-Cr(Mo)-4Fe 两种共晶合金分别在 1 100 ℃和 1 200 ℃下进行热处理，并通过 OM、
SEM 和 SEM-EDS 对比研究了组织的高温稳定性。 结果表明，1 100 ℃以上热处理后，共晶枝晶中心的 Cr(Mo)层片被夹
断，形成相应的间隔。 随着温度和时间的增加，间隔的数量和长度逐渐增加，组织的高温稳定性变差。 Fe 的添加也在一
定程度上降低了其高温稳定性。
NiAl-Cr(Mo) and NiAl-Cr(Mo)-4Fe eutectic alloys were heat treated at 1 100 ℃ and 1 200 ℃, respectively, and their high temperature stability was studied by OM, SEM and SEM-EDS. The results show that the Cr (Mo) layer in the center of eutectic dendrite is clipped and the corresponding gap is formed after heat treatment above 1 100 ℃. With the increase of temperature and time, the number and length of interstitial space gradually increase, and the high-temperature stability of the microstructure becomes worse. The addition of Fe also reduces its high temperature stability to a certain extent