本文選題：鋯合金 + 應(yīng)變　； 參考：《稀有金屬材料與工程》2017年06期

【摘要】：基于實驗設(shè)計研究了應(yīng)變參數(shù)對鋯合金動載下塑性變形機制的影響。通過控制應(yīng)變速率,采用應(yīng)變限位環(huán)的方法實現(xiàn)了鋯合金高應(yīng)變速率下應(yīng)變參數(shù)的單一分離,應(yīng)變速率為2300 s~(-1)時,獲得了4個不同的應(yīng)變水平:0.11、0.21、0.30、0.33。基于鋯合金高應(yīng)變速率不同應(yīng)變下微觀組織的表征,預(yù)測了應(yīng)變參數(shù)對鋯合金動載下塑性變形過程的影響。結(jié)果表明:形變帶和轉(zhuǎn)變帶是鋯合金不同應(yīng)變階段塑性變形的重要方式,形變帶內(nèi)部由嚴重變形的晶粒組成,而轉(zhuǎn)變帶內(nèi)部主要由100~300 nm的細小等軸晶粒組成。在變形初始階段,鋯合金變形以柱面滑移和錐面滑移為主,以孿生為輔;隨著應(yīng)變的增加,位錯持續(xù)增殖,位錯的塞積導(dǎo)致應(yīng)力增加,直至最大抗壓強度;當應(yīng)變達到一個臨界值時,形成形變帶;隨應(yīng)變繼續(xù)增加,形變帶發(fā)生動態(tài)再結(jié)晶,演化為轉(zhuǎn)變帶;應(yīng)變繼續(xù)增加,便會在剪切帶內(nèi)部誘發(fā)微空洞、微裂紋,直至材料斷裂。
[Abstract]:Based on the experimental design, the effect of strain parameters on the plastic deformation mechanism of zirconium alloy under dynamic loading was studied. By controlling strain rate, single separation of strain parameters at high strain rate of zirconium alloy was realized by using strain limit ring method. At strain rate of 2300 s-1, four different strain levels: 0.110.21n0.300.30g 0.33 were obtained. Based on the characterization of microstructure of zirconium alloy at high strain rate, the influence of strain parameters on the plastic deformation process of zirconium alloy under dynamic loading was predicted. The results show that the deformation band and the transition band are important for the plastic deformation of zirconium alloy at different strain stages. The deformation band is composed of severely deformed grains, while the inner transformation band is mainly composed of 100 ~ 300nm fine equiaxed grains. In the initial stage of deformation, the deformation of zirconium alloy is dominated by cylinder slip and cone slip, supplemented by twinning, and the dislocation continues to proliferate with the increase of strain, and the piling of dislocation leads to the increase of stress until the maximum compressive strength is reached. When the strain reaches a critical value, a deformation band is formed; with the increase of strain, dynamic recrystallization occurs in the deformation band, which evolves into a transition zone; if the strain continues to increase, microvoids and microcracks will be induced in the shear band until the material breaks.
【作者單位】： 表面物理與化學(xué)重點實驗室;中國工程物理研究院;
【基金】：國家自然科學(xué)基金(51401187)
【分類號】：TG146.414

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本文編號：1938500