Femtosecond quantification of void evolution during rapid material failure.
Femtosecond quantification of void evolution during rapid material failure.
复制标题
快速量化在快速材料失败期间空隙演化的定量。
DOI：
10.1126/sciadv.abb4434
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发表时间：
2020-12
期刊：
影响因子：
13.6
通讯作者：
Milathianaki D
中科院分区：
文献类型：
--
作者：
Coakley J;Higginbotham A;McGonegle D;Ilavsky J;Swinburne TD;Wark JS;Rahman KM;Vorontsov VA;Dye D;Lane TJ;Boutet S;Koglin J;Robinson J;Milathianaki D
超亮X射线捕捉材料在高应变率灾难性失效过程中损伤累积的顺序。了解高速撞击，以及随后的高应变率材料变形和潜在的灾难性失效，对于包括天体物理学，材料科学和航空航天工程在内的一系列科学和工程学科至关重要。考虑到在极短的时间尺度上通过实验量化材料演变的挑战，变形和失效机制还没有得到彻底的理解。在这里，铜箔通过皮秒激光烧蚀快速应变，并与飞秒x射线自由电子（XFEL）脉冲原位探测。小角X射线散射（SAXS）监测孔隙分布演变，而广角散射（WAXS）同时确定应变演变。在高应变率失效过程中用超快SAXS定量表征纳米尺度的能力，补充了WAXS，代表了可以用XFEL进行的科学范围的扩大。结果表明，最终失效发生通过空隙成核，生长和合并，和数据吻合良好的分子动力学模拟。
Ultrabright x-rays capture the sequence of material damage accumulation during high strain rate catastrophic failure. Understanding high-velocity impact, and the subsequent high strain rate material deformation and potential catastrophic failure, is of critical importance across a range of scientific and engineering disciplines that include astrophysics, materials science, and aerospace engineering. The deformation and failure mechanisms are not thoroughly understood, given the challenges of experimentally quantifying material evolution at extremely short time scales. Here, copper foils are rapidly strained via picosecond laser ablation and probed in situ with femtosecond x-ray free electron (XFEL) pulses. Small-angle x-ray scattering (SAXS) monitors the void distribution evolution, while wide-angle scattering (WAXS) simultaneously determines the strain evolution. The ability to quantifiably characterize the nanoscale during high strain rate failure with ultrafast SAXS, complementing WAXS, represents a broadening in the range of science that can be performed with XFEL. It is shown that ultimate failure occurs via void nucleation, growth, and coalescence, and the data agree well with molecular dynamics simulations.
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影响因子：
6.1
作者：
Allen AJ;Zhang F;Kline RJ;Guthrie WF;Ilavsky J
通讯作者：
Ilavsky J
影响因子：
4.6
作者：
Higginbotham A;Stubley PG;Comley AJ;Eggert JH;Foster JM;Kalantar DH;McGonegle D;Patel S;Peacock LJ;Rothman SD;Smith RF;Suggit MJ;Wark JS
通讯作者：
Wark JS
影响因子：
35
作者：
Emma, P.;Akre, R.;Galayda, J.
通讯作者：
Galayda, J.
影响因子：
3.2
作者：
Bringa, EM;Cazamias, JU;Caturla, MJ
通讯作者：
Caturla, MJ
影响因子：
3.9
作者：
Gilbert, James A.;Kropf, A. Jeremy;Myers, Deborah J.
通讯作者：
Myers, Deborah J.