【摘要】：為了研究壓縮變形條件下晶界對純鈦內(nèi)部球形空洞壓實(shí)愈合的影響規(guī)律,建立了壓縮變形條件下球形空洞的雙晶鈦模型。采用分子動(dòng)力學(xué)方法模擬比較了三組不同的空洞與晶界的位置關(guān)系,即空洞遠(yuǎn)離晶界、空洞靠近晶界和空洞在晶界上。結(jié)果表明:在恒溫壓縮變形條件下,若空洞遠(yuǎn)離晶界,兩端發(fā)射位錯(cuò)環(huán),最易愈合;若空洞靠近晶界,只有一端發(fā)射位錯(cuò)環(huán),愈合速度次之;若空洞在晶界上,不發(fā)射位錯(cuò)環(huán),只是沿著兩不同晶粒的密排面發(fā)射線性位錯(cuò),最后愈合。
[Abstract]:In order to study the effect of grain boundaries on the compaction healing of spherical cavities in pure titanium under compression deformation, a double crystal titanium model of spherical cavities under compression deformation was established. The molecular dynamics method was used to simulate and compare the location relationship between three groups of holes and grain boundary, that is, the hole is far away from the grain boundary, and the cavity is close to the grain boundary and on the grain boundary. The results show that under the condition of constant temperature compression deformation, if the cavity is far away from the grain boundary and the dislocation ring is emitted at both ends, it is most likely to heal, and if the hole is close to the grain boundary, there is only one end emitting dislocation ring, and the healing rate is the second. If the cavity is on the grain boundary, it does not emit the dislocation ring, but only emits linear dislocation along the dense surface of two different grains, and finally heals up.
【作者單位】： 上海工程技術(shù)大學(xué)材料工程學(xué)院;上海工程技術(shù)大學(xué)汽車工程學(xué)院;
【基金】：上海高校青年教師培養(yǎng)資助計(jì)劃項(xiàng)目(ZZGJD12081)
【分類號(hào)】：TG146.23

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