GUO Jianting LI Hui SUN Chao ZHU Yaoxiao Institute of Metal Research
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Academia Sinica
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Shenyang
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China GUO Jianting
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Professor
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Institute of Metal Research
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Academia Sinica
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Shenyang 110015
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China
金属学报(英文版)
The microstructure and the mechanical properties from room temperature up to 1050℃ of Ni_3Al alloys containing 0—0.6 at.-%Zr,0—7.7 at.-%Cr and 0—2.22 at.-%B have been studied.It was found that the temperature dependence of their yield strength variation reveals to be anomalous,i.e.the strength increases with the temperature raising,and then decreases till it surpassed the peak value.Both Zr and Zr+Cr may improve the yield strength of the al- loys in the entire range of testing temperatures,as well as the tensile strength and elongation under high temperatures.B is favourable to raise the tensile and yield strengths of the alloys, and also plasticity.But the strength will reduce as B added is over 2.22 at.-%.The Ni_(20)Al_3B_6 and Ni_3Al eutectic mixture like islands and globes precipitated inside the grains and along the grain bounderies,which are harmful to the strength and ductility,may be formed when the B content exceeds the limit of solubility.
关键词:
Ni_3Al
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GUO Jianting SUN Chao LI Hui GUAN Hengrong Institute of Metal Research
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Academia Sinica
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Shenyang
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China GUO Jianting
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Associate Professor
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Institute of Metal Research
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Academia Sinica
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Shenyang
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China
金属学报(英文版)
The effect of boron content(0 to 2.22 at.-% )on isothermal oxidation behaviour of Ni_3Al at 750 to 1150℃ for 3 to 100 h has been studied.The results show that the isothermal oxidation kinetics of Ni_3Al with various B contents at different temperatures obeys the parabolic law. The compounds with 0.52 to 1.37 at.-%B show the best oxidation resistance.The morphology and microstructure of the scales have also been investigated.
关键词:
intermetallic compound
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