研究了新型磁致伸缩材料Fe-Ga合金的应力腐蚀性能.采用恒载荷和慢应变速率拉伸(SSRT)试验,结合电化学测试技术,研究了铸态Fe85Ga15多晶在模拟海水中的应力腐蚀.结果表明,开路电位下,模拟海水中薄板光滑试样恒载荷拉伸能够发生低于材料抗拉强度的断裂,且断裂时间明显依赖于外加应力的大小,外加应力愈大,断裂时间愈短.这表明铸态Fe85Ga15合金在模拟海水中能够发生应力腐蚀开裂(SCC),且SCC归一化门槛应力为σscc/σb=0.34.慢应变速率拉伸显示,SCC敏感性在应变速率为5×10-7/s时最大,用强度损失表示为I.=(1-σc/σ b)×100％ =35％.阴极极化升高而阳极极化降低恒载荷SCC断裂时间.这些结果初步表明铸态Fe85 Ga15合金在模拟海水中的应力腐蚀为阳极溶解型.
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