dislocation n. 1.【醫(yī)學(xué)】脫位,脫臼;離位,轉(zhuǎn)位,位移。 2.【地質(zhì)學(xué);地理學(xué)】斷層,斷錯;【物理學(xué)】位錯。 3.混亂,打亂。 a disastrous economic dislocation 災(zāi)難性的經(jīng)濟混亂。
The presence of small amount of liquid at grain boundaries tends to form thin viscous layer which surrounds the finer grains . intergranular fracture may occur at the grain boundaries between two fine grains not covered by viscous phases . the high ductility achieved at low strain rates is generally attributed to dislocation glide - creep accommodation mechanisms 原始晶界上產(chǎn)生少量液相,形成薄的固液共存粘性層并包圍細化的晶粒,沿晶斷裂主要發(fā)生在無粘性層的細晶粒間;而在較低應(yīng)變速率下,三叉晶界位錯攀援?蠕變協(xié)調(diào)機制松弛晶界滑移產(chǎn)生的應(yīng)力集中,晶界上產(chǎn)生較多液相,有利于晶界滑移進行。