鐵鎳基非晶質合金之氫致脆裂

Hydrogen Induced Cracking in Fe-Ni Based Amorphous Alloy

本實驗以鐵鎳基非晶形合金Fe40Ni38Mo4B18為試樣，在兩種測試條件下觀察氫致脆裂的現象，即陰極充氫下的拉伸試驗及無外加應力下的靜態充氫。利用其它實驗所獲致的氫擴散係數、氫濃度及溶解度等數據，從熱力學的觀點計算出各種情況下試片內部聚集的氫濃度。推測造成氫致脆裂的原因可能係氫在材料內部累積了相當大的氣壓，同時氫亦造成了金屬玻璃本身金屬鍵強度的降低。

An Fe-Ni base amorphous alloy Fe40Ni38Mo4B18 was used as the sample material. Cracking of the alloy induced by hydrogen under two charging conditions (dynamic charging and static charging) was examined. The accumulation of hydrogen in the specimen was determined from the diffusivity and surface hydrogen concentration data previously obtained by a permeation method. The mechanism of hydrogen-induced cracking by dynamic charging could be ascribed to the decohesion effect of the interstitial hydrogen, whereas the cause of cracking by static charging was attributed to the combined effect of interstitial hydrogen and internal hydrogen pressure.