TiNi形状记忆合金在充氢时形成的氢致马氏体和氢化物可使合金的KIC明显下降,相对损失高达96%,但其氢致马氏体对KIC相对损失的贡献仅约1.8%,而且不随氢浓度而改变.因此氢致KIC下降几乎全部归因于氢化物.氢化物引起的相对损失△KTiNiH IC/KIC和氢化物的含量(质量分数,%)WTiNiH有关,即△KTiNiH IC/KIC(%)=93(1-eWTiNiH/9.5).当充氢电流i≥15 mA/cm2时,在氢化物处能产生微裂纹,但微裂纹不会使断裂韧性进一步下降.
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