Acta Metallurgica et Materialia最新文献_第4页

Steady-state power-law creep in “inclusion matrix” composite materials “夹杂基体”复合材料的稳态幂律蠕变

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00100-A

E. Herve , R. Dendievel , G. Bonnet

引用次数: 11

Influence of reinforcement fracture on the cyclic stress-strain curve of metal-matrix composites 钢筋断裂对金属基复合材料循环应力-应变曲线的影响

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00096-E

J. Llorca, P. Poza

引用次数: 33

On the enhanced grain growth in ultrafine grained metals 超细晶金属中晶粒生长增强的研究

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00087-C

Jianshe Lian , Ruslan Z. Valiev , Bernard Baudelet

引用次数: 127

Models of short-range order in a face-centered cubic Fe-Ni-Cr alloy with a high concentration of nitrogen 含高浓度氮的面心立方Fe-Ni-Cr合金的近阶模型

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00107-7

M. Grujicic , W.S. Owen

引用次数: 43

Fracture mechanics of a new blister test with stable crack growth 具有稳定裂纹扩展的新型水泡试验的断裂力学

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00108-8

Kai-Tak Wan , Yiu-Wing Mai

引用次数: 89

Growth rates and misorientation relationships between growing nuclei/grains and the surrounding deformed matrix during recrystallization 再结晶过程中生长核/晶粒与周围变形基体的生长速率和取向偏差关系

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00111-8

D. Juul Jensen

{"title":"Growth rates and misorientation relationships between growing nuclei/grains and the surrounding deformed matrix during recrystallization","authors":"D. Juul Jensen","doi":"10.1016/0956-7151(95)00111-8","DOIUrl":"10.1016/0956-7151(95)00111-8","url":null,"abstract":"<div><p>Average growth rates and misorientations between recrystallization nuclei (or grains) and neighbouring deformed matrix material have been studied for partially recrystallized samples by the electron back scattering pattern (EBSP) technique in heavily cold rolled aluminium and copper. It was studied how the annealing time and the crystallographic orientation of nuclei/grains affects the growth rates and distribution of misorientations. The two materials, aluminium and copper, develop a weak and a strong recrystallization cube texture respectively. Information about effects of cube texture strength was therefore also obtained. It was found that grains of cube orientation grow faster than grains of other orientations. A wide distribution of misorientation relationships was observed to exist between the growing grains and the neighbouring deformed matrix, and this distribution was not significantly affected by the annealing time. The faster growth of the cube oriented grains may be ascribed to a larger misorientation between cube grains and deformed matrix than that between other grains and the matrix.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 11","pages":"Pages 4117-4129"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)00111-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76898960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 166

Stochastic model of an R-curve due to crack bridging 裂缝桥接r曲线的随机模型

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00112-9

T. Troczynski

{"title":"Stochastic model of an R-curve due to crack bridging","authors":"T. Troczynski","doi":"10.1016/0956-7151(95)00112-9","DOIUrl":"10.1016/0956-7151(95)00112-9","url":null,"abstract":"<div><p>A stochastic model is formulated to analyse crack tip shielding from the applied load, as a function of microstructural parameters and loading conditions, in nontransforming polycrystalline ceramics. The model recognizes the random nature of the microstructural elements, such as grains, inclusions or fibers, which are traversed by the propagating crack. The role of distribution of grain size, and strength of grains and interfaces in the development of the crack interface bridging is emphasized, and numerically evaluated. The standard model parameters are chosen to represent aluminium oxide, as an extensive experimental data base is available for this material. Quantitative predictions of toughening and closure stresses within the bridging process zone are in agreement with experimental data quoted in the literature. It is found that a typical coarse-grained alumina with geometric average grain size of 10 μm and geometric standard deviation of 1.3 exhibits a 5 mm long bridging zone, with the maximum closure stress of 86 MPa, and the maximum toughening due to crack bridging of 90 J/m<sup>2</sup>. The R-curve has been confirmed to depend both on the average grain size and on the grain size distribution, as well as on the level of residual stresses, single grain strength, interfacial roughness and the grain boundary strength. The validity of the relatively simple Monte Carlo model proposed in this work opens up a possibility for optimization of microstructures of monolithic and composite ceramics for maximum resistance to fracture.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 11","pages":"Pages 4131-4140"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)00112-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74044097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Electron microscopy study of the formation of Ni5Al3 in a Ni62.5Al37.5 B2 alloy—II. Plate crystallography Ni62.5Al37.5 B2合金中Ni5Al3形成的电镜研究-ⅱ。板晶体学

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00102-2

Dominique Schryvers , Ying Ma , Lajos Toth , Lee Tanner

引用次数: 10

Influence of a damage zone on high temperature crack growth in brittle materials 损伤区对脆性材料高温裂纹扩展的影响

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00095-D

D.B. Sabljic, D.S. Wilkinson

{"title":"Influence of a damage zone on high temperature crack growth in brittle materials","authors":"D.B. Sabljic, D.S. Wilkinson","doi":"10.1016/0956-7151(95)00095-D","DOIUrl":"10.1016/0956-7151(95)00095-D","url":null,"abstract":"<div><p>High temperature crack growth in ceramics often occurs by the nucleation, growth and coalescence of cavities in a region ahead of the crack tip known as the damage zone. Models describing this type of behaviour generally assume that the presence of cavities does not affect the stress distribution ahead of the crack tip. In this study, a crack growth simulation has been developed which incorporates the effects of cavity nucleation, growth and coalescence on the stress field ahead of the crack. Cavity growth dominated both by grain boundary diffusion and by surface diffusion has been modelled. The models follow both the transient effects which occur following initial loading and the development of a steady-state regime under conditions of constant applied stress intensity factor <em>K</em><sub>I</sub>. In general, the wedging action due to cavity growth reduces the stress field near the crack tip. However, this is largely compensated for by an increase in the damage zone size, as a result of load transfer from the crack tip to the end of the damage zone. We have therefore demonstrated that the established analytical models which do not account for stress redistribution give a much better description of steady-state crack growth behavior than one would expect.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 11","pages":"Pages 3937-3945"},"PeriodicalIF":0.0,"publicationDate":"1995-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)00095-D","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87869368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Thermodynamic analysis on the role of hydrogen in anodic stress corrosion cracking 氢在阳极应力腐蚀开裂中作用的热力学分析

Acta Metallurgica et Materialia Pub Date : 1995-11-01 DOI: 10.1016/0956-7151(95)00090-I

L. Qiao, X. Mao

引用次数: 33