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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Ductile-brittle transition of pure Al-interlayer sandwiched by high strength Al alloy
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Ductile-brittle transition of pure Al-interlayer sandwiched by high strength Al alloy

机译：高强度铝合金夹心的纯铝中间层的脆性-脆性转变

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Four point bending test (FPB) was conducted to investigate the unusual ductile-brittle transition (DBT) of pure Al sheet with decreasing thickness, sandwiched by 2024 alloy through explosive cladding. The results show that, with the decrease in thickness of Al-interlayer restricted by parallel interfaces, obvious differences appear for the measured load-displacement curves, and fracture toughness characterized by critical J integral drops down remarkably. Correspondingly, brittle cleavage patterns, mainly belong to {1 0 0} besides a very few {110}, were observed on the fracture surfaces and increase gradually in the fraction as decreasing in the thickness of Al-interlayer. A finite element simulation showed that the crack-tip plastic zone spreads rapidly in the Al sheet and advances along the ligament confined by the two interfaces. With either decreased thickness or increased load, the stress triaxiality and maximum principal tensile stress ahead of crack-tip continue to increase, which make the materials become more brittle.
机译：进行了四点弯曲试验（FPB），以研究厚度不断减小的纯铝板的异常延性-脆性转变（DBT），该板通过爆炸熔覆夹在2024合金中间。结果表明，随着平行界面限制铝层厚度的减小，所测得的载荷-位移曲线出现明显差异，以临界J积分为特征的断裂韧性明显下降。相应地，在断裂面上观察到脆性解理模式，除极少的{110}外，主要属于{1 0 0}，并随着Al-中间层厚度的减小而逐渐增加。有限元模拟表明，裂纹尖端塑性区在Al板中迅速扩展，并沿着由两个界面限制的韧带前进。随着厚度减小或载荷增加，裂纹尖端之前的三轴应力和最大主拉伸应力将继续增加，这使材料变得更脆。

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