Test environments and mechanical properties of Zr-base bulk amorphous alloys
Test environments and mechanical properties of Zr-base bulk amorphous alloys
复制标题
DOI：
10.1007/s11661-998-0004-6
复制
发表时间：
1998-07-01
影响因子：
2.8
通讯作者：
Inoue, A
中科院分区：
文献类型：
--
作者：
Liu, CT;Heatherly, L;Inoue, A
通过室温拉伸和压缩试验，研究了Zr-10Al-30 Cu-5 Ni（BAA-10）和Zr-10Al-5 Ti-17.9Cu-14.6Ni（BAA-11）两种Zr基大块非晶合金的力学性能。采用熔滴铸造法和感应熔炼-喷射铸造法成功地生产出直径达7 mm的BAA铸锭。BAA试件主要发生弹性变形，然后沿沿着剪切带发生灾难性破坏。对断裂区域的检查揭示了由温度的大幅升高引起的韧性断裂特征，这可归因于储存的弹性应变能转化为热。令人惊讶的是，“液滴”位于邻近断裂部分的主要剪切带裂纹被观察到，这表明在断裂过程中发生局部熔化。剪切带，剪切带裂纹，断裂面相对于应力轴的角度取向是完全不同的BAA试样在拉伸和压缩测试。这表明，在塑性变形过程中，剪切应力和正应力都可能在剪切带的发展中起作用。BAAs的拉伸性能在室温下对测试环境不敏感。激光解吸质谱（LDMS）检测到BAA与蒸馏水和重水的反应。这些结果表明，水分引起的氢脆BAA可能被掩盖的灾难性断裂剪切带。
The mechanical properties of two Zr-base bulk amorphous alloys (BAA), Zr-1oAl-30Cu-5Ni (BAA-10) and Zr-10Al-5Ti-17.9Cu-14.6Ni (BAA-11), were studied by both tensile and compressive tests at room temperature in various test environments. The BAA ingots up to 7 mm in diameter were successfully produced by both are melting and drop casting and induction melting and injection casting. The BAA specimens deformed mainly elastically, followed by catastrophic failure along shear bands. Examination of the fracture region revealed ductile fracture features resulting from a substantial increase in temperature, which was attributable to the conversion of the stored elastic strain energy to heat. Surprisingly, "liquid droplets" located at major shear-band cracks adjacent to the fracture section were observed, indicating the occurrence of local melting during fracture. The angle orientation of shear bands, shear-band cracks, and fracture surfaces relative to the stress axis is quite different for BAA specimens tested in tension and compression. This suggests that both shear stress and normal stress may play a role in developing shear bands during plastic deformation. The tensile properties of BAAs were found to be insensitive to the test environment at room temperature. However, the reaction of BAAs with distilled water and heavy water was detected by laser desorption mass spectrometry (LDMS). These results suggest that moisture-induced hydrogen embrittlement in BAAs may be masked by catastrophic fracture following shear bands.