Impression creep; a new creep test

Chu, S. N. G.; Li, J. C. M.

doi:10.1007/bf00552241

Cited by 312 publications

(98 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Later, instrumented indentation techniques, where load, displacement, and time could be controlled or monitored, were developed to determine the creep properties of bulk materials. An example is the impression creep test using a cylindrical flat punch for examining metals and polymers [194][195][196][197][198][199] (see [199] for a comprehensive review on impression creep tests). With the advent of nanoindentation, measurements of strain rate and temperature effects in thin films and nanostructured materials became possible [200][201][202][203][204][205].…”

Section: Introductionmentioning

confidence: 99%

Scaling, dimensional analysis, and indentation measurements

Cheng

2004

Materials Science and Engineering: R: Reports

935

512

View full text Add to dashboard Cite

We provide an overview of the basic concepts of scaling and dimensional analysis, followed by a review of some of the recent work on applying these concepts to modeling instrumented indentation measurements. Specifically, we examine conical and pyramidal indentation in elastic-plastic solids with power-law workhardening, in power-law creep solids, and in linear viscoelastic materials. We show that the scaling approach to indentation modeling provides new insights into several basic questions in instrumented indentation, including, what information is contained in the indentation load-displacement curves? How does hardness depend on the mechanical properties and indenter geometry? What are the factors determining piling-up and sinking-in of surface profiles around indents? Can stress-strain relationships be obtained from indentation load-displacement curves? How to measure time dependent mechanical properties from indentation? How to detect or confirm indentation size effects? The scaling approach also helps organize knowledge and provides a framework for bridging micro-and macroscales. We hope that this review will accomplish two purposes: (1) introducing the basic concepts of scaling and dimensional analysis to materials scientists and engineers, and (2) providing a better understanding of instrumented indentation measurements. # 2004 Published by Elsevier B.V.

show abstract

Section: Introductionmentioning

confidence: 99%

Scaling, dimensional analysis, and indentation measurements

Cheng

2004

Materials Science and Engineering: R: Reports

935

512

View full text Add to dashboard Cite

show abstract

“…In the process, the indenter is pushed into the surface at a fixed rate of indentation until a predetermined load or penetration depth is reached, then the load is held fixed while the indenter continues to creep into the material. Li and coworkers [347,348] have demonstrated the use of indentation and impression creep in investigating the creep deformation mechanism of materials at high homologous temperatures. In other words, identation creep technique can be used to determine the power law stress exponent and activation energy.…”

mentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

837

345

View full text Add to dashboard Cite

In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

show abstract

“…Creep properties are one of the essential characteristics for utilizing of the alloys which are exposed at high service temperatures. developed by Chu and Li [11] is a modified method of indentation creep test. This technique has frequently been used to investigate the creep properties of magnesium alloys such as AZ91 [12], AM60 [13], MRI53 [14], Mg-5Sn [15], etc.…”

Section: Introductionmentioning

confidence: 99%

Impression creep properties of hypoeutectic Mg-xSi alloys

Badri¹,

Miresmaeili²,

Nami³

2021

View full text Add to dashboard Cite

Impression creep behavior of as-cast Mg-xSi alloys (x = 0.5, 0.8, 1.2 wt.%) was studied under shear modulus-normalized stress values ranging from 0.009 to 0.016 at temperatures between 398 and 491 K. The results show that creep properties of these alloys are improved with increasing Si content under all the applied loads and temperatures, and Mg-1.2Si alloy has minimum creep rate and thus maximum creep resistance. It is attributed to the higher volume fraction of Mg2Si, which can reduce grain boundary sliding during the creep test. Stress exponent of all the alloys is between 4.06 and 7.09 in the temperature range of 398 to 447 K. It is changed from the range of 3.

show abstract

Impression creep; a new creep test

Cited by 312 publications

References 3 publications

Scaling, dimensional analysis, and indentation measurements

Scaling, dimensional analysis, and indentation measurements

Nanocrystalline materials and coatings

Impression creep properties of hypoeutectic Mg-xSi alloys

Contact Info

Product

Resources

About