Effect of annealing twins on Hall–Petch relation in polycrystalline materials

Pande, C. S.; Rath, B. B.; Imam, M. Ashraf

doi:10.1016/j.msea.2003.09.100

Cited by 107 publications

(42 citation statements)

References 26 publications

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“…[32][33][34][35][36] All of these experimental results for nanostructured metals are generally in line with prior work at coarser microstructural length scales; most studies have concluded that twin boundaries are similar to general high-angle grain boundaries in terms of their ability to disrupt dislocation motion. [37][38][39][40][41][42] Although there remain many questions as to the specific roles of stacking faults and twins on deformation of nanostructured materials, all of the preceding results point to an important contribution from these defects. In this context, it would be very desirable to have experimental control over, e.g., stacking fault energy (SFE) and twin density in bulk nanostructured alloys.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Ni-Co alloys with tailorable grain size and twin density

Ferreira

Schuh

2005

Metall Mater Trans A

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We present an experimental approach to systematically produce nanostructures with various grain sizes and twin densities in the Ni-Co binary system. Using electrodeposition with various applied current densities and organic additive contents in the deposition bath, we synthesize nanostructured fcc and hcp solid solutions with a range of compositions. Due to the low stacking fault energy (SFE) of these alloys, growth twins are readily formed during deposition, and by adjusting the deposition conditions, a range of twin boundary densities is possible. The resulting nanostructured alloys cannot be described by a single characteristic length scale, but instead must be characterized in terms of (1) a true grain size pertaining to general high-angle grain boundaries and (2) an effective grain size that incorporates twin boundaries. Analysis of Hall-Petch strength scaling for these materials is complicated by their dual length scales, but the hardness trends found in Ni-80Co are found to be roughly in line with those seen in pure nanocrystalline nickel.

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Section: Introductionmentioning

confidence: 99%

Nanostructured Ni-Co alloys with tailorable grain size and twin density

Ferreira

Schuh

2005

Metall Mater Trans A

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“…After phase transformation, twin will form, which results in a strengthening of matrix and increases the yield strength to a certain value ( * ∞ ). It can be deduced that the strengthening effect of twinning structure caused by the interaction between dislocation slip and twinning interface will increase with the twin density [17,18]. Many published results [19,20] have indicated that the HP relationship is well obeyed for large grain size (d ≥ 1 m) with the grain-size exponent close to −1/2 for a wide range of grain sizes and materials.…”

Section: A Modified Hall-petch Relationmentioning

confidence: 99%

“…∞ is often identified with the friction stress needed to move individual dislocation, and k often referred to as the HP slope. It should be pointed out that ∞ means only a nominal friction stress, since the value of ∞ appears to vary from case to case even in the same material [18]. Beside the lattice friction stress, this feature is also related to the presence of initial microstructure in the specimen [11] such as precipitate, dislocation structure and other interfaces.…”

Section: Introductionmentioning

confidence: 99%

Effects of transformation twin on Hall–Petch relationship in MnCu alloy

Zhong

Sakaguchi

Yin

2008

Materials Science and Engineering: A

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“…[21][22][23] In the present article, the Fe-19.38Mn-5.29Si-8.98Cr-4.83Ni alloy was subjected to hot forging at 1373 K (1100°C) and subsequent solution treating at 1373 K (1100°C). Obviously, the twin boundaries (Figure 2(a)) are annealing twins for solution-treated Fe-19.38Mn-5.29Si-8.98Cr-4.83Ni alloy.…”

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confidence: 99%

A Novel Training-Free Processed Fe-Mn-Si-Cr-Ni Shape Memory Alloy Undergoing δ → γ Phase Transformation

Peng

Wang

Du³

et al. 2016

Metall Mater Trans A

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We not only suppress the formation of twin boundaries but also introduce a high density of stacking faults by taking advantage of d fi c phase transformation in a processed Fe-19.38Mn-5.29Si-8.98Cr-4.83Ni shape memory alloy. As a result, its shape memory effect is remarkably improved after heating at 1533 K (1260°C) (single-phase region of d ferrite) and air cooling due to d fi c phase transformation.Low-cost Fe-Mn-Si-based shape memory alloys (SMAs), possessing one-way shape memory effect, have attracted much attention for several decades as a possible alternative to the expensive Ti-Ni-based SMAs. [1][2][3][4][5][6] A large recovery strain of 9 pct has been reported in a single-crystalline Fe-30Mn-1Si alloy. [1] However, only 2 to 3 pct recovery strain is attained in ordinary polycrystalline-processed Fe-Mn-Si-based alloys without special treatment. [4][5][6] There are three kinds of special treatment-training, [7][8][9] thermomechanical, [5,10,11] and ausforming [12,13] -that improve the recovery strain of polycrystalline-processed Fe-Mn-Si SMAs to 4 to 5 pct. The preceding treatments not only increase the production cost, but also make it difficult to fabricate the components with complicated shape. Recently, we manufactured a novel training-free cast Fe-20.2Mn-5.6Si-8.9Cr-5.0Ni alloy by simple synthesis processing, consisting only of casting plus annealing, and made a breakthrough to attain a tensile recovery strain of 7.6 pct in this cast alloy. [14] Nevertheless, there are still shortcomings for cast alloys as compared with processed alloys, i.e., lower recovery stress and worse mechanical properties. Thus, we raise an issue regarding how to obtain training-free processed Fe-Mn-Si-based SMAs.Recently, we investigated the interaction between twin boundaries and stress-induced e martensite in Fe-MnSi-based SMAs and found that this interaction not only suppresses the stress-induced e martensitic transformation, but also severely distorts the twin interfaces. [14] As a result, a high density of twin boundaries results in a poor shape memory effect in processed Fe-Mn-Si-based SMAs, and a good shape memory effect could be obtained by inhibiting the formation of twin boundaries. Furthermore, Kajiwara indicated that a high density of stacking faults is beneficial to obtaining a good shape memory effect for processed Fe-Mn-Si-based SMAs. [5] Indeed, the previously mentioned special treatments that effectively improve the shape memory effect introduce the high density of stacking faults besides reducing the twin boundaries for processed Fe-Mn-Si-based SMAs. [5,8,[13][14][15] Here, we also achieve the purpose of both reducing the twin boundaries and introducing the high density of stacking faults using d fi c phase transformation in a Fe-19.38Mn-5.29Si-8.98Cr-4.83Ni alloy. Therefore, in the present article, a novel training-free processed Fe-Mn-Si-Cr-Ni alloy is developed based on d fi c phase transformation.The ingot of Fe-19.38Mn-5.29Si-8.98Cr-4.83Ni SMA was prepared by induction melting in an argon atmosphere. Thi...

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Effect of annealing twins on Hall–Petch relation in polycrystalline materials

Cited by 107 publications

References 26 publications

Nanostructured Ni-Co alloys with tailorable grain size and twin density

Nanostructured Ni-Co alloys with tailorable grain size and twin density

Effects of transformation twin on Hall–Petch relationship in MnCu alloy

A Novel Training-Free Processed Fe-Mn-Si-Cr-Ni Shape Memory Alloy Undergoing δ → γ Phase Transformation

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