【摘要】：采用真空電弧熔煉制備了Ni-28.5Al-43V成分的合金。對于真空電弧熔煉紐扣錠不同位置處微觀組織及力學(xué)性能進行了研究。利用光學(xué)顯微鏡(OM),X射線衍射(XRD),掃描電鏡(SEM),分析了合金不同凝固位置處的相組成和組織形態(tài)。結(jié)果表明,合金的凝固組織主要是由V相枝晶組織與NiAl+V片層共晶組成。同時對初生相及共晶相進行顯微硬度測定。初生V相硬度(HV)在398~425之間,約為純V硬度的3倍,表明V的固溶強化效果較為明顯。另外,高溫壓縮強度與室溫斷裂韌度較NiAl合金均有很大提高,表明V的加入可提高NiAl合金的室溫塑性與高溫強度。
[Abstract]:The Ni-28.5Al-43V alloy was prepared by vacuum arc melting. The microstructure and mechanical properties of vacuum arc melting button ingot at different positions were studied. The phase composition and microstructure of the alloy at different solidification positions were analyzed by (OM) X ray diffraction (XRD),) scanning electron microscope (SEM),). The results show that the solidification microstructure of the alloy is mainly composed of V phase dendrite structure and NiAl V lamellar eutectic. The microhardness of primary phase and eutectic phase was also measured. The hardness of primary V phase (HV) is between 398 and 425, which is about 3 times of that of pure V, which indicates that the solution strengthening effect of V is obvious. In addition, the compression strength at high temperature and fracture toughness at room temperature are significantly higher than those of NiAl alloy, which indicates that the addition of V can improve the room temperature ductility and high temperature strength of NiAl alloy.
【作者單位】： 內(nèi)蒙古科技大學(xué)材料與冶金學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(51564041) 內(nèi)蒙古自然科學(xué)基金資助項目(2014MS0518) 內(nèi)蒙古科技大學(xué)產(chǎn)學(xué)研培育基金項目(PY201509) 內(nèi)蒙古科技大學(xué)材料與冶金學(xué)院青年人才資助項目(2014CY012)
【分類號】：TG291

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