The effect of ductility minimum temperature in CuNi25 alloy

Nowosielski, R.; Sakiewicz, P.; Gramatyka, P.

doi:10.1016/j.jmatprotec.2005.02.119

Cited by 12 publications

(15 citation statements)

References 16 publications

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“…Ductility trough movement was also found in a CuNi25 alloy by Nowosielski et al 148 It was proved that the increase in strain rate led to the displacement of ductility minimum temperature to a higher one, as illustrated in Fig. 30.…”

Section: Movement Of Ductility Troughsupporting

confidence: 54%

Unified mechanism of intergranular embrittlement based on non-equilibrium grain boundary segregation

Liu

Wang

et al. 2013

International Materials Reviews

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The review is aimed at presenting a unified approach in understanding the mechanism of nonequilibrium grain boundary segregation, which can satisfactorily describe the three types of intergranular embrittlement, namely, reverse temper embrittlement of steels, intergranular corrosion embrittlement of stainless steels and intermediate temperature embrittlement of metals and alloys. The review starts with a broad perspective of non-equilibrium grain boundary segregation, including thermally induced non-equilibrium grain boundary segregation and stress induced non-equilibrium grain-boundary segregation. Next, it focuses on the recent progress made in the non-equilibrium grain boundary segregation, including (1) critical time, (2) segregation peak temperature, (3) segregation peak temperature movement for thermally induced and stress induced non-equilibrium grain boundary segregation, and (4) the effect of temperature difference on thermally-induced non-equilibrium grain boundary segregation. Next, the attention is focused on the grain boundary coverage of elements and intergranular embrittlement phenomena. Three types of intergranular embrittlement is analysed in terms of (1) the ductility healing effect induced by the critical time, (2) embrittlement peak or ductility trough induced by the segregation peak temperature, (3) embrittlement peak or ductility trough movement induced by the segregation peak temperature movement and (4) widening and deepening of ductility trough induced by differences in temperature. These experimental phenomena concerning the three types of intergranular embrittlement are consistent with the models of thermally induced and stress induced non-equilibrium grain boundary segregations of impurities, instead of precipitation or equilibrium grain boundary segregation. Towards the end, we visit the subject of grain boundary segregation and associated embrittlement process from the viewpoint of fracture resistance and briefly discuss different perspectives that are of practical significance. List of symbolsA constant b the Burger's vector B Norton coefficient C b (t c ) grain boundary concentration at critical time C b(s50) equilibrium concentration of solute at the grain boundaries C g concentration of solute within the grains C v s~0 ð Þ equilibrium vacancy concentration at grain boundaries C v s~s ð Þ grain boundary vacancy concentration induced by the tensile stress D b the diffusivity D c diffusion coefficients for complexes under or in absence of applied tensile stress D i diffusion coefficients for solute atoms under or in absence of applied tensile stress E the elastic or Young's modulus -E the embrittlement sensitivity in K/at-% of solute at the grain boundary E b formation energy of vacancy solute atom complex International Materials Reviews 2013 VOL 58 NO 5263 E f vacancy formation energy E gb the elastic or Young's modulus of grain boundary region F v the formation energy of a vacancy in the boundary region H Z intergranular Auger peak to peak height of an element normalised with the ...

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Section: Movement Of Ductility Troughsupporting

confidence: 54%

Unified mechanism of intergranular embrittlement based on non-equilibrium grain boundary segregation

Liu

Wang

et al. 2013

International Materials Reviews

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“…It has been reported that the causes for ''Intermediate temperature embrittlement'' are the segregation of solute atoms and impurities to the grain boundaries or etc. [13][14][15] Meanwhile, as noted above, the elongation of Hi Cr-& Hi N-Co-Cr-Mo alloy increases at intermediate temperatures depending on strain rates. As stated in Fig.…”

Section: Large Elongation At Intermediate Temperaturesmentioning

confidence: 67%

Mechanical Properties of Biomedical Co-33Cr-5Mo-0.3N Alloy at Elevated Temperatures

2008

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In order to examine the mechanical properties of a biomedical Co-33Cr-5Mo-0.3N alloy at elevated temperatures, tensile tests have been conducted in the temperature range from room temperature to 1373 K at initial strain rates of 1:0 Â 10 À1 s À1 and 1:4 Â 10 À4 s À1 . The 0.2% proof stress and the tensile strength as a function of temperature have the plateau and the hump, respectively, at intermediate temperatures. The elongation to fracture increases at intermediate temperatures and abruptly decreases at higher temperatures. The decrease of the elongation at higher temperatures arises from the intergranular fracture, possibly caused by the equilibrium segregation of harmful elements such as sulfur. The serrations on the stress-strain curves are observed at intermediate temperatures. The temperature range where the elongation is enhanced and the serrations appear is shifted to lower temperatures at a low strain rate. The 0.2% proof stress does not increase with increasing strain rate and the strain rate sensitivity exhibits negative values at intermediate temperatures. It is considered that a serration leading to large elongation results from the dynamic strain aging.

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“…5. Reduction in area vs. test temperature for CuNi25 alloy, after deformation with strain rates: (1) 2:7 Â 10 À1 s À1 and (2) 2:7 Â 10 À3 s À1 [6]. relative to strain rate is also shown in Fig.…”

Section: Uncertainty Relative To Strain Rate -Strain Rate Embrittlementmentioning

confidence: 84%

“…Nowosielski et al found experimentally the embrittlement in Fig. 5 is intergranular failure [6] and indicated the roles of the grain boundary in determining the reduction in area.…”

Section: Peak Temperature Induced Intermediate Temperature Embrittlementmentioning

confidence: 96%

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The measurement uncertainty of reduction in area of metals in tensile testing system

Liu

et al. 2015

Measurement

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The effect of ductility minimum temperature in CuNi25 alloy

Cited by 12 publications

References 16 publications

Unified mechanism of intergranular embrittlement based on non-equilibrium grain boundary segregation

Unified mechanism of intergranular embrittlement based on non-equilibrium grain boundary segregation

Mechanical Properties of Biomedical Co-33Cr-5Mo-0.3N Alloy at Elevated Temperatures

The measurement uncertainty of reduction in area of metals in tensile testing system

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