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首页> 外文期刊>Metallurgical and Materials Transactions A >Shear Behavior of AA6061 Aluminum in the Semisolid State Under Isothermal and Nonisothermal Conditions
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Shear Behavior of AA6061 Aluminum in the Semisolid State Under Isothermal and Nonisothermal Conditions

机译：AA6061铝在等温和非等温条件下的半固态剪切行为

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摘要

The shear behavior of a 6061 aluminum alloy was studied in the semisolid state at large solid fractions. The tests were carried out either at constant temperature after partial solidification (i.e., isothermal shear tests) or during solidification at low cooling rate (i.e., nonisothermal shear tests). In isothermal conditions, results show that (1) the mechanical behavior depends on the volume fraction of the solid phase present in the sample at the temperature of the test, (2) there is a critical solid fraction corresponding to the coalescence of the solid grains beyond which shear stress increases very sharply with increasing solid fraction, and (3) the mushy alloy exhibits viscoplastic behavior with a strain-rate-sensitivity parameter close to about 0.17. In nonisothermal conditions, results show that stress increases continuously with decreasing temperature whatever the strain rate. However, at high strain rate, it was observed that cracks developed when the solid fraction approaches 1, leading to a slower stress increase compared to that observed at low strain rate. Finally, modeling of this behavior is carried out by considering a cohesion parameter of the solid phase, which depends on solid fraction and strain rate.
机译：研究了6061铝合金在大固态下处于半固态时的剪切行为。该测试或者在部分凝固之后在恒温下进行（即，等温剪切试验），或者在低冷却速率下凝固期间进行（即非等温剪切试验）。在等温条件下，结果表明：（1）机械性能取决于测试温度下样品中固相的体积分数；（2）对应于固相晶粒聚结的临界固相分数超过该值，剪切应力会随着固含量的增加而急剧增加，并且（3）糊状合金表现出粘塑性行为，其应变率敏感性参数接近于0.17。在非等温条件下，结果表明，无论应变速率如何，应力都随着温度的降低而连续增加。然而，在高应变率下，观察到当固体分数接近1时出现裂纹，与低应变率下观察到的相比，应力增加的速度更慢。最后，通过考虑固相的内聚参数对这种行为进行建模，该参数取决于固相分数和应变率。

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