Martin May L, Liew Li-Anne, Read David T, Christenson Todd R, DelRio Frank W, Geaney John
Material Measurement Laboratory, National Institute of Standards and Technology, Boulder, CO, 80305, United States.
HT MicroAnalytical, Albuquerque, NM, 87109, United States.
Sens Actuators A Phys. 2020;314. doi: 10.1016/j.sna.2020.112239.
Two different LIGA electrodeposited nickel alloys displayed distinct fracture modes after meso-scale tensile testing. The Ni-Co alloy failed in a ductile manner, while the Ni-Fe alloy failed in a more brittle-appearing manner. Various factors affecting the fracture are discussed; it was determined that the fracture mode did not depend upon the strain rate but did depend upon the sample geometry. The difference in the microstructure is likely the cause of the difference in fracture mode, as the Ni-Co alloy is fine-grained, while the Ni-Fe alloy is nano-grained and likely failed by a creep-like mechanism.
两种不同的LIGA电沉积镍合金在中尺度拉伸试验后呈现出不同的断裂模式。镍钴合金以韧性方式失效，而镍铁合金失效方式更显脆性。讨论了影响断裂的各种因素；确定断裂模式不取决于应变速率，而是取决于样品几何形状。微观结构的差异可能是断裂模式不同的原因，因为镍钴合金是细晶粒的，而镍铁合金是纳米晶粒的，可能通过类似蠕变的机制失效。
