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bkcx木蟲 (小有名氣)
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[交流]
【求助】土問什么是廣義層錯(cuò)能?
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| 與一般的層錯(cuò)能有什么不同呢? |
禁蟲 (正式寫手)
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禁蟲 (正式寫手)
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木蟲 (正式寫手)
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廣義層錯(cuò)能 - generalized stacking fault energy (GSFE) Plastic deformation in crystalline materials largely depends on the properties of dislocations, in particular their mobility. While continuum description of deformation of a crystalline metal can be made reasonably well by considering the elastic properties of dislocations and neglecting the core, crystallographic aspects of dislocation motion require precise understanding of the core effects. The concept of the generalized stacking fault (GSF) energy was proposed as means to describe this. GSF energy, a fundamental property of a given material, can be determined using first principles total energy calculations. |
新蟲 (初入文壇)
| 層錯(cuò)是晶體中普遍存在的(如FCC晶體中的普遍存在的本征層錯(cuò)intrinsi stacking fault),對(duì)應(yīng)于特定的相對(duì)滑動(dòng)位移,形成層錯(cuò)所需要的能量稱為層錯(cuò)能。廣義層錯(cuò)能(generalized stacking fault energy, GSF)是對(duì)層錯(cuò)能概念的一個(gè)拓展,把特定位移擴(kuò)展到任意位移,最早由Vitek在1968年定量提出(當(dāng)然,相應(yīng)的滑動(dòng)概念由Frenkel在1920s提出)。Vitek文中最早給出能量差是用\gamma表示,所以GSF能量有時(shí)也稱為\gamma-surface(二維的能量面)。GSF energy的梯度給出了Peierls-Nabarro模型中的恢復(fù)力,從而能夠更加精確地確定位錯(cuò)的芯結(jié)構(gòu)及Peierls應(yīng)力。此后,J.R.Rice在1992年提出不穩(wěn)定層錯(cuò)能的概念(unstable stacking fault energy, USF),它決定了位錯(cuò)成核所需要克服的勢(shì)壘高度。 |
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