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首页> 外文期刊>Materials Characterization >Tensile deformation behavior of spray-deposited FVS0812 heat-resistant aluminum alloy sheet at elevated temperatures
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Tensile deformation behavior of spray-deposited FVS0812 heat-resistant aluminum alloy sheet at elevated temperatures

机译：喷射沉积的FVS0812耐热铝合金板在高温下的拉伸变形行为

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摘要

The tensile deformation behavior of spray deposited FVS0812 heat-resistant aluminum alloy sheet was studied by uniaxial tension tests at temperatures ranging from 250 deg C to 450 deg C and strain rates from 0.001 to 0.1 s~(-1). The associated fracture surfaces were examined by scanning electron microscopy (SEM). The results show that the degree of work-hardening increases with decreasing temperature, and exhibits a small decrease with increasing strain rate; the strain rate sensitivity exponent increases with increasing temperature. The flow stress increases with increasing strain rate but decreases with increasing temperature. The total elongations to fracture increase not only with increasing temperature, but also with increasing strain rate, which is in marked contrast with the normal inverse dependence of elongation on the strain rate exhibited by conventional aluminum alloy sheets. The SEM fracture analysis indicates that the dependence of elongation on the strain rate may be due to the presence of a transition from plastic instability at lower strain rates to stable deformation at higher strain rates for fine-grained materials produced by spray deposition.
机译：通过单轴拉伸试验研究了喷涂沉积的FVS0812耐热铝合金板在250℃至450℃的温度和0.001至0.1 s〜（-1）的应变速率下的拉伸变形行为。通过扫描电子显微镜（SEM）检查相关的断裂表面。结果表明，加工硬化程度随温度降低而增加，而随应变率的增加而减小。应变率灵敏度指数随温度升高而增加。流动应力随着应变率的增加而增加，但随着温度的升高而减小。断裂的总伸长率不仅随温度升高而增加，而且随应变率的增加而增加，这与常规铝合金板所呈现的伸长率对应变率的正常反相关性形成鲜明对比。 SEM断裂分析表明，伸长率对应变速率的依赖性可能是由于存在以下情况：从较低的应变速率下的塑性不稳定性过渡到较高的应变速率下的稳定变形（对于通过喷涂沉积生产的细粒材料而言）。

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