The refinement mechanism of grain at room temperature can be described as dislocation tangle and dislocation node form in the initial grain with severe plastic deformation , then the dislocation node form subgrains or grains . subgrains become grains by snipping of the subgrain boundaries under the action of shearing stress 室溫ecap細(xì)化晶粒的機(jī)理可描述為:隨著強(qiáng)烈塑性變形的進(jìn)行,原始晶粒中產(chǎn)生了很多位錯(cuò)纏結(jié)和位錯(cuò)胞,進(jìn)而位錯(cuò)胞崩塌變?yōu)閬喚Щ蚓Я#瑏喚ЯT诤罄m(xù)ecap剪應(yīng)力作用下,通過亞晶界被剪斷而變?yōu)榫Я!?