Acta Metallurgica et Materialia最新文献_第10页

Rolling textures of pure nickel, nickel-iron and nickel-cobalt alloys 纯镍、镍铁和镍钴合金的轧制纹理

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90169-8

R.K. Ray

引用次数: 97

Trapping of point defects in real alloys by considering the effect of short range order 考虑近程阶次影响的实合金点缺陷捕获

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90168-X

Ge Yu

{"title":"Trapping of point defects in real alloys by considering the effect of short range order","authors":"Ge Yu","doi":"10.1016/0956-7151(95)90168-X","DOIUrl":"https://doi.org/10.1016/0956-7151(95)90168-X","url":null,"abstract":"<div><p>Based on the random walk of point defect in concentrated alloys, the kinetics of the annihilation of point defects in a f.c.c. alloy is studied by computer simulation. The effect of the degree of order is especially considered by using the pair model for describing the atomistic interaction. The simulations cover nearly the whole temperature range in which short range order or short range clustering exists. Due to the special treatments, the escape probability for various trap structures (0D or 1D and with different reaction radius) can be determined as a function of the annealing time. Further evaluation yields the trapping time of point defects for broad variation of relevant parameters including the composition of alloy and the mobility ratio of the components. Empirical functions are developed for expressing these dependences.</p><p>Compared to the random alloy simplification reported in the preceding paper [1], there is no change in the essential form of the trapping kinetics. The relation between the activation energy for the annihilation of point defects and that for the self-diffusion of atoms in real alloys is revealed, which yields the background for studying the diffusion properties through the investigation of point defect annihilation.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3851-3860"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)90168-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91699227","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: 0

Formation of Cu-type shear bands and their influence on deformation and texture of rolled f.c.c. {112}〈111〉 single crystals cu型剪切带的形成及其对轧制f.c.{112} < 111 >单晶变形和织构的影响

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90164-7

P. Wagner, O. Engler, K. Lücke

引用次数: 144

Effects of early transition metal solutes on the D03-B2 critical temperature of Fe3Al 早期过渡金属溶质对Fe3Al D03-B2临界温度的影响

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90171-X

L. Anthony, B. Fultz

引用次数: 66

Residual stresses around Vickers indents 维氏压痕周围的残余应力

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90148-5

A. Pajares , F. Guiberteau , R.W. Steinbrech , A. Dominguez-Rodriguez

{"title":"Residual stresses around Vickers indents","authors":"A. Pajares , F. Guiberteau , R.W. Steinbrech , A. Dominguez-Rodriguez","doi":"10.1016/0956-7151(95)90148-5","DOIUrl":"10.1016/0956-7151(95)90148-5","url":null,"abstract":"<div><p>The residual stresses generated by Vickers indentation in brittle materials and their changes due to annealing and surface removal were studied in 4 mol% yttria partially stabilized zirconia (4Y-PSZ). Three experimental methods to gain information about the residual stress field were applied: (i) crack profile measurements based on serial sectioning, (ii) controlled crack propagation in post indentation bending tests and (iii) double indentation tests with smaller secondary indents loccated around a larger primary impression. Three zones of different residual stress behavior are deduced from the experiments. Beneath the impression a crack free spherical zone of high hydrostatic streses exists. This “core” zone is followed by a transition regime where indentation cracks develop but still experience hydrostatic stresses. Finally, in an outward third zone, the crack contour is entirely governed by the tensile residual stress intensity (elastically deformed region). Annealing and surface removal reduce this crack driving stress intensity. The specific changes of the residual stresses due to the post indentation treatments are described and discussed in detail for the three zones.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3649-3659"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)90148-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72890976","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: 21

Weibull modelling of particle cracking in metal matrix composites 金属基复合材料颗粒裂纹的Weibull模型

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90152-3

C.A. Lewis, P.J. Withers

{"title":"Weibull modelling of particle cracking in metal matrix composites","authors":"C.A. Lewis, P.J. Withers","doi":"10.1016/0956-7151(95)90152-3","DOIUrl":"10.1016/0956-7151(95)90152-3","url":null,"abstract":"<div><p>An investigation into the occurrence of reinforcement cracking within a particulate ZrO<sub>2</sub>/2618 Al alloy metal matrix composite under tensile plastic straining has been carried out, special attention being paid to the dependence of fracture on particle size and shape. The probability of particle cracking has been modelled using a Weibull approach, giving good agreement with the experimental data. Values for the Weibull modulus and the stress required to crack the particles were found to be within the range expected for the cracking of ceramic particles. Additional information regarding the fracture behaviour of the particles was provided by <em>in situ</em> neutron diffraction monitoring of the internal strains, measurement of the variation in the composite Young's modulus with straining and by direct observation of the cracked particles. The values of the particle stress required for the initiation of particle cracking deduced from these supplementary experiments were found to be in good agreement with each other and with the results from the Weibull analysis.</p><p>Further, it is shown that while both the current experiments, as well as the previous work of others, can be well described by the Weibull approach, the exact values of the Weibull parameters so deduced are very sensitive to the approximations and the assumptions made in constructing the model.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3685-3699"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)90152-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83971880","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: 89

Crack nucleation in columnar ice due to elastic anisotropu and grain boundary sliding 弹性各向异性和晶界滑动作用下的柱状冰裂纹成核

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90162-0

R.C. Picu, V. Gupta

{"title":"Crack nucleation in columnar ice due to elastic anisotropu and grain boundary sliding","authors":"R.C. Picu, V. Gupta","doi":"10.1016/0956-7151(95)90162-0","DOIUrl":"10.1016/0956-7151(95)90162-0","url":null,"abstract":"<div><p>The phenomenon of crack nucleation from grain triple junctions is investigated in columnar freshwater ice at rates of loading where the dislocation pile-up process is inhibited. Two mechanisms are explored. First, crack nucleation due to elastic anisotropy-induced singular stress field at the triple junction is investigated. To this end, both the singularity exponent and the energy release values associated with crack nucleation are provided for random orientations of the grain boundaries and material axes of the grains. The computed energy release rate values fall much short of those required for nucleation. Next, by assuming a linear viscous response for the boundary, the stress concentrations due to grain boundary sliding are computed, and the resulting energy release rate values are shown to be sufficiently high to overcome the barrier for crack nucleation. Experimental evidence for grain boundary sliding-induced boundary decohesions at — 10°C are presented in the companion paper. At such temperatures, sliding is activated even though the strain rate of loading invokes an overall brittle response from the polycrystal.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3783-3789"},"PeriodicalIF":0.0,"publicationDate":"1995-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-7151(95)90162-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91307444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 27

A solute drag treatment of the effects of alloying elements on the rate of the proeutectoid ferrite transformation in steels 溶质拖曳处理中合金元素对钢中原共析铁素体转变速率的影响

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90160-4

G.R. Purdy , Y.J.M. Brechet

引用次数: 135

Point defect concentration relaxation and creep transients in binary oxides 二元氧化物中的点缺陷浓度、松弛和蠕变瞬变

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90144-2

M. Jiménez-Melendo , A. Domínguez-Rodríguez , J. Castaing

引用次数: 5

Effects of reinforcement geometry on the elastic and plastic behaviour of metal matrix composites 增强几何形状对金属基复合材料弹塑性性能的影响

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90158-2

A.A. Mammoli, M.B. Bush

引用次数: 19