退火温度对ARB-Cu室温拉伸断裂行为的影响

发布时间：2018-05-05 19:43

本文选题：超细晶 + 累积叠轧　；参考：《金属学报》2017年08期

【摘要】：利用TEM观察累积叠轧法(ARB)制备的超细晶Cu的微观结构,在IBTC-5000单轴疲劳试验机上对制备态及不同温度退火态的ARB-Cu进行单向静态拉伸实验,通过SEM观察力学测试后试样的断口形貌。结果表明:在实验温度范围内,退火处理均使ARB-Cu的屈服强度和抗拉强度下降,当退火温度低于再结晶温度时,ARB-Cu的屈服强度和抗拉强度均随退火温度的升高而升高;当退火温度高于再结晶温度时,其强度迅速下降。当退火温度为200℃时,ARB-Cu的屈服强度和抗拉强度达到退火态最大值。随退火温度的升高,ARBCu的晶粒尺寸略微增大,晶粒分布逐渐由制备态的单峰分布转变为双峰分布,断口形貌显示出塑性逐渐增加的趋势。退火处理有助于ARB材料焊合界面结合强度的提高,退火温度越高,焊合界面结合性能越好。焊合界面经历的叠轧道次越多,其结合效率越高,其理论计算公式为E=(1-0.5~n)×100%。
[Abstract]:The microstructure of superfine crystal Cu prepared by cumulative rolling process (ARB) was observed by TEM. The unidirectional static tensile test was carried out on the prepared state and the annealed ARB-Cu at the IBTC-5000 uniaxial fatigue test machine. The fracture morphology of the specimen after the mechanical test was observed by SEM. The results showed that the annealing treatment all made ARB-Cu within the experimental temperature range. When the annealing temperature is lower than recrystallization temperature, the yield strength and tensile strength of ARB-Cu increase with the increase of annealing temperature. When the annealing temperature is higher than the recrystallization temperature, the strength decreases rapidly. When the annealing temperature is 200 c, the yield strength and tensile strength of ARB-Cu reach the maximum annealing state. With the increase of annealing temperature, the grain size of ARBCu increases slightly, and the grain distribution gradually changes from the single peak distribution of prepared state to Shuangfeng distribution, and the fracture morphology shows the trend of increasing plasticity. The annealing treatment helps to improve the bonding strength of the welding interface of ARB materials, the higher the annealing temperature, the better the bonding interface bonding performance. Welding bonding is better. The more times the bonding passes, the higher the bonding efficiency is. The theoretical formula is E= (1-0.5~n) x 100%..

【作者单位】：昆明理工大学材料科学与工程学院;
【基金】：国家自然科学基金项目No.51201077~~
【分类号】：TG146.11;TG166.2

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