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在温度为100℃~525℃,应变速率为0.008s-1、0.013s-1条件下,采用恒应变速率法研究AA5083合金板的流变行为,以及流变应力、变形温度与应变速率之间的关系。结果表明,在该条件下,AA5083合金受应变速率硬化与应变硬化共同作用;其应变速率敏感性指数随温度的升高逐渐增大,应变硬化指数随温度的升高逐渐减弱至零,而后略有增大。建立了材料基于温度变化的修正Fields-Backofen本构模型,其值与实验值吻合良好。
At constant strain rate of 0.008s-1 and 0.013s-1, the rheological behavior of AA5083 alloy plate was investigated by means of constant strain rate method at temperatures ranging from 100 ℃ to 525 ℃ and between strain rate and deformation temperature and strain rate Relationship. The results show that under this condition, AA5083 alloy is affected by strain rate hardening and strain hardening. The strain rate sensitivity index increases with increasing temperature. The strain hardening index decreases gradually to zero with increasing temperature, and then slightly Have increased. The revised Fields-Backofen constitutive model based on temperature change was established, and its value was in good agreement with the experimental data.