Hydrogen embrittlement of pseudobinary l12-type Ni3(Alo.4Mno.6) intermetallic compound
Hydrogen embrittlement of pseudobinary l12-type Ni3(Alo.4Mno.6) intermetallic compound
复制标题
准二元l12型Ni3(Alo.4Mno.6)金属间化合物的氢脆
DOI：
10.1007/bf02652545
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发表时间：
1988
期刊：
影响因子：
--
通讯作者：
O. Izumi
中科院分区：
文献类型：
--
作者：
N. Masahashi;T. Takasugi;O. Izumi
从氢脆敏感性的角度考察了具有足够变形能力且屈服应力与温度正相关的ll2型金属间化合物Ni2（Al0.4,Mn0.6）的力学性能。拉伸率和极限抗拉强度分别随应变速率的增加而显著增加，而屈服应力几乎不变，不仅与试验环境无关，而且与应变速率无关。另一方面，阴极预充氢的延伸率恶化，而烘烤处理使延伸率恢复。断口观察显示伸长率与断裂模式之间存在预期的相关性；随着伸长率的增加，穿晶断裂区域增大。由此结果表明，可以通过抽气或烘烤的方法从试样内部除去氢气，也可以通过充氢的方法从试样表面注入氢气；也就是说，在这两个过程中，氢的渗透几乎是可逆的。由此可以得出结论，该合金具有严重的氢脆敏感性，无论是从样品中的残余氢还是从环境中渗透的氢。
The mechanical properties of the Ll2-type intermetallic compound Ni2(Al0.4,Mn0.6), which exhibited enough deformability accompanied with the positive temperature dependence of yield stress, were examined from the point of view of its susceptibility to hydrogen embrittlement. Remarkable and moderate increases of elongation and ultimate tensile strength were observed by evacuating and with increasing strain rate, respectively, although the yield stress was almost constant independent of not only testing environment but also strain rate. On the other hand, the cathodically precharged hydrogen showed deteriorated elongations while the baking treatment resulted in restoration of elongation. Fractographic observation revealed the expected correlation between elongation and fracture mode; with increasing elongation the transgranularly fractured region increased. From this result, it is suggested that hydrogen can be removed from the specimen interior by evacuating or baking, and also that hydrogen can be injected from the sample surface by hydrogen charging; that is to say, hydrogen permeation is almost reversible for both processes. It is thus concluded that the present alloy has severe hydrogen embrittlement susceptibility, both from the residual hydrogen in the specimens as well as from that penetrated from the environment.