采用电子束熔炼对Nb-Ti-Si-Cr-Al-Hf多元合金进行重熔,研究合金锭成分与组织的均匀性以及合金的硬度、室温断裂韧性、高温抗压性能.结果表明:电子束熔炼易导致合金元素的挥发损失,使得合金锭的成分不均匀;高的冷却速度有助于细小、均匀的等轴组织形成,其中硅化物相的显微硬度HV约为1100,是Nb固溶体相的3倍左右;电子束熔炼Nb-Si系多元合金的室温断裂韧性(KQ)约为10.3MPa·m1/2;在1250℃的抗压强度约为426.3MPa,且具有一定的高温塑性.
参考文献
[1] | J.-C. Zhao;J.H. Westbrook .Ultrahigh-Temperature Materials for Jet Engines[J].MRS bulletin,2003(9):622-627. |
[2] | BEWLAY B P;JACKSON M R;ZHAO J C et al.A review of very-high temperature Nb-silicide-based composites[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2003,34:2043-2052. |
[3] | M.R.Jackson;B.P.Bewlay .High-Temperature Refractory Metal-Intermetallic Composites[J].JOM,1996(1):39-44. |
[4] | P.R.Subramanian;M.G.Mendiratta .The Development of Nb-Based Advanced Intermetallic Alloys for Structural Applications[J].JOM,1996(1):33-38. |
[5] | BEWLAY B P;JACKSON M R;LIPSITT H A .The balance of mechanical and environmental properties of a muhielenment niobium-niobium silicide-hased in situ composites[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,1996,27:3801-3088. |
[6] | BEWLAY B P;LEWANDOWSKI J J;JACKSON M R .Refractory metal-intermetallic in-situ composites for air engines[J].JOM-Journal of the Minerals Metals and Materials Society,1997,49:44-45. |
[7] | BEWLAY B P;JACKSON M R;SUBRAMANIAN P R .Progressing high-temperature refractory-metal silicide in-situ composites[J].JOM-Journal of the Minerals Metals and Materials Society,1999,51:32-36. |
[8] | 戴永年;杨斌.有色金属材料的真空冶金[M].北京:冶金工业出版社,2000:24-27. |
[9] | K.S.Chan;D.L.Davidson .Effects of Ti addition on cleavage fracture in Nb-Cr-Ti solid solution alloys[J].Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science,1999(4):925-939. |
[10] | TIAN Y X;GUO J T;ZHOU L Z et al.Microstructure and room temperature toughness of cast Nbss/Silicides composites alloyed with Hf[J].Material Science Letter,2008,82(17-18):2657-2660. |
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