Enhancement of strength and ductility in non-equiatomic CoCrNi medium-entropy alloy at room temperature via transformation-induced plasticity
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Elongation
Tensile testing
Ductility (Earth science)
Stacking-fault energy
Elongation
Tensile testing
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Bulk ultrafine grained (UFG) materials produced by severe plastic deformation often have low ductility. Here the authors report that simultaneous increases in ductility and strength can be achieved by tailoring the stacking fault energy (SFE) via alloying. Specifically, UFG bronze (Cu 10wt.% Zn) with a SFE of 35mJ∕m2 was found to have much higher strength and ductility than UFG copper with a SFE of 78mJ∕m2. Accumulations of both twins and dislocations during tensile testing play a significant role in enhancing the ductility of the UFG bronze. This work demonstrates a strategy for designing UFG alloys with superior mechanical properties.
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Ductility (Earth science)
Severe Plastic Deformation
Bronze
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Tension tests were carried out on two shapes of tensile specimens of A2024-T3, A7N01-T4 and A7075-T6 sheets. A-fractured elongation is generally greater than B-fractured one. Elongation evaaluted is greater than one not evaluated particularly when fracture occurs near the gage mark. Mean elongation B-fractured and evaluated is nearly equal to mean one A-fractured. This fact shows suitability of the JIS evaluation method. Even if B-fracture occurs, when the elongation not evaluated is superior to the elongation specified in the JIS, the JIS evaluation method for elongation is unnecessary in an industrial tension test.
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Tensile testing
Textile
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Industrial pure iron specimens with a thickness that varied from 0.2 to 2.0 mm were investigated in tensile tests to examine the influence of specimen thickness on the percentage elongation and deformation energy.
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Based on the tensile curves of 3 kinds of metastable austenitic stainless steels, the quantitative parameters--averaging M--transformation--induced plasticity increment of per unit volume fraction of martensite, D, and intrinsic plasticity increment DI have been proposed in this paper, and D is approaching to DI. Experimental results showed that D value decreases with increasing carbon content, and the decrease of Stacking fault energy is beneficial to D value, the strain rate has no obvious effect on D.
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Packaging steel is characterized by low thickness (0.1 mm – 0.5 mm) and ferritic microstructure resulting from low carbon contents. In combination with continuous annealing processes and temper rolling, this results in only little elongation observed in tensile tests. However, as in real forming processes much higher deformation occurs, it is important to receive true stress-true strain data up to a highest possible level e.g. to characterize material for finite element analysis. Therefore, tensile tests with three different measuring lengths (80 mm, 50 mm, 20 mm) were conducted for the packaging steel TH415. Likewise, the testing speed was reduced to investigate the possibility to receive more elongation under the condition of a constant stress level. The results revealed a significant increase in elongation when using smaller tensile test geometries. As well, the reduction in testing speed leads to much higher elongation while showing only little strain rate influence. While for the 80 mm geometry and standard speed no homogenous forming condition could be reached due to early failure before Lüders strain, this could be improved by using smaller testing specimens and a lower strain rate. Combining the influence of strain rate and geometry a significant increase of more than ten percentage points in elongation was reached.
Elongation
Tensile testing
Strain (injury)
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Ductility (Earth science)
Stacking-fault energy
Stacking fault
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Necking
Elongation
Tensile testing
Strain (injury)
Diffusionless transformation
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Ductility (Earth science)
Stacking-fault energy
Bond energy
Stacking fault
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