| 有序度对Ni_4Mo合金在氢气中脆性的影响(英文) |
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| 引用本文： | 程晓英,李慧改.有序度对Ni_4Mo合金在氢气中脆性的影响(英文)[J].上海大学学报(英文版),2005(6). |
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| 作者姓名： | 程晓英 李慧改 |
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| 作者单位： | Institute of Materials Shanghai University，Shanghai 200072 P.R.China，Institute of Materials，Shanghai University，Shanghai 200072 P.R.China |
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| 基金项目： | Project supported by National Natural Science Foundatron ofChina(Grant No .59895157),and Science Foundation of ShanghaiMunicipal Commission of Science and Technology ( Grant No .02ZE14033) |
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| 摘 要： | 1IntroductionNickel-based alloys containing 20 -30 wt % Mo isknown to be essential for corrosion resistance in re-ducing media1],especially for resistance to HCl at alltemperatures and concentrations2]. However , uponexposure to elevated temperatures in the range of600 -800 ℃,these alloys suffer an al most completeloss of roomtemperature ductility as a result of long-range ordering (LRO) to Ni4Mo .It is considered thatthe loss of ductility mainly results from the environ-mental embrittle…
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Effect of Ordering on Embrittlement of Ni_4Mo Alloy in Hydrogen Gas |
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| CHENG Xiao-yingLI Hui-gaiInstitute of Materials,Shanghai University,Shanghai ,P.R. China.Effect of Ordering on Embrittlement of Ni_4Mo Alloy in Hydrogen Gas[J].Journal of Shanghai University(English Edition),2005(6). |
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| Authors: | CHENG Xiao-yingLI Hui-gaiInstitute of Materials Shanghai University Shanghai PR China |
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| Institution: | CHENG Xiao-yingLI Hui-gaiInstitute of Materials,Shanghai University,Shanghai 200072,P.R. China |
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| Abstract: | The fracture behavior of disordered and ordered Ni_4Mo alloy was investigated by tensile tests in hydrogen gas or during hydrogen charging. The results show that the ductility of the disordered alloy decreased slightly with the hydrogen pressure increasing, while that of the ordered alloy decreased rapidly with the hydrogen pressure increasing. However, the ductility of both disordered and ordered alloys reduced similarly seriously with the charging current density increasing. Therefore, the mechanism of order-induced embrittlement of Ni_4Mo alloy in hydrogen gas is supposed to be that atomic order accelerates the kinetics of the catalytic reaction for the disso- ciation of molecular H_2 into atomic H. |
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| Keywords: | Ni_4Mo alloy hydrogen embrittlement order disorder hydrogen gas hydrogen charging |
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