Acta Metallurgica et Materialia最新文献_第9页

Acta Metallurgica J. Herbert Hollomon award J. 赫伯特-霍洛蒙冶金学报奖

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90143-4

引用次数: 0

Segregation to an (A0/2)[11̄0] edge dislocation in Cu0.1Ni0.9 Cu0.1Ni0.9中偏析为(A0/2)[11′0]边位错

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90146-9

R.W. Smith, R. Najafabadi , D.J. Srolovitz

{"title":"Segregation to an (A0/2)[11̄0] edge dislocation in Cu0.1Ni0.9","authors":"R.W. Smith, R. Najafabadi , D.J. Srolovitz","doi":"10.1016/0956-7151(95)90146-9","DOIUrl":"10.1016/0956-7151(95)90146-9","url":null,"abstract":"<div><p>Atomistic simulations of segregation to a dissociated <span><math><mtext>(a</mtext><msub><mi></mi><mn>0</mn></msub><mtext>/2)[1</mtext><mtext>1</mtext><mtext>̄</mtext><mtext>0]</mtext></math></span> edge dislocation in the solid solution alloy Cu<sub>0.1</sub>Ni<sub>0.9</sub> have been performed. Segregation to the stacking fault between the partials is minimal. Results obtained with a general embedded atom method potential and one optimized for the NiCu system differ significantly. Simulations employing the optimized potentials show significantly more Cu segregation to the dislocation cores than do simulations performed with the general potentials. When the general potentials are employed, the Cu concentration around the dislocation is well described using classical segregation isotherms based upon the stress distribution around the dislocation, except in the dislocation core region. Deviations from the theoretically predicted segregation profile around the dislocation core are largest along the slip plane. When the optimized potentials are used, the deviations from the predicted segregation behavior are significantly larger. The large deviations associated with the optimized potentials were traced to the inadequacy of describing the local heat of segregation in terms of the elastic work <em>σ</em><sub>h</sub><em>ΔV</em>. This can be rectified by adding a term to the heat of segregation that explicitly includes the composition dependence. The failure of the classical segregation isotherm to describe the segregation behavior around a dislocation is associated with non-ideal alloy thermodynamics and the inadequacy of linear elasticity to appropriately describe the core region of the dislocation. The failure of the classical segregation isotherm within the core appears to result from the fact that the core atoms have different atomic coordination than those in the bulk material.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3621-3632"},"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)90146-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88517451","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: 10

Fatigue damage in aluminum single crystals—I. On the surface containing the slip burgers vector 铝单晶的疲劳损伤- 1。在包含滑动伯格矢量的表面上

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90165-5

T. Zhai, J. Martin, G. Briggs

引用次数: 39

Fiber damage during the consolidation of PVD Ti6Al4V coated nextel 610TM alumina fibers PVD Ti6Al4V涂层nextel 610TM氧化铝纤维固结过程中的纤维损伤

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90145-0

J. Warren, D.M. Elzey, H.N.G. Wadley

{"title":"Fiber damage during the consolidation of PVD Ti6Al4V coated nextel 610TM alumina fibers","authors":"J. Warren, D.M. Elzey, H.N.G. Wadley","doi":"10.1016/0956-7151(95)90145-0","DOIUrl":"10.1016/0956-7151(95)90145-0","url":null,"abstract":"<div><p>Titanium matrix composites reinforced with sol-gel synthesized α-alumina fiber tows have attracted interest as a potentially low cost continuous fiber reinforced metal matrix composite system. We have conducted a detailed investigation of fiber damage during high temperature consolidation of PVD Ti6Al4V metallized sol-gel alumina fiber tows. Using both hot isostatic pressing and interrupted vacuum hot press consolidation cycles, the two principal mechanisms of fiber damage have been experimentally identified to be microbending/fracture and fiber matrix reaction. A time dependent micromechanics model incorporating the evolving geometry and mechanical properties of both the fibers and matrix has been formulated to simulate the fiber bending/failure mechanism in a representative unit cell and explore the effect of fiber strength loss due to reaction with the matrix. This model has been used to design a process cycle that minimizes damage by exploiting the enhanced superplastic deformation of the initially nanocrystalline PVD Ti6Al4V matrix.</p></div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3605-3619"},"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)90145-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74930430","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: 20

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

Dislocation configurations in metal-matrix composites correlated with numerical predictions 金属基复合材料中的位错构型与数值预测相关

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90147-7

C.Y. Barlow , N. Hansen

引用次数: 23

Finite-difference modelling of self-propagating high-temperature synthesis of materials 材料自传播高温合成的有限差分模型

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90173-6

C. Bowen, B. Derby

引用次数: 19

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. Ray

引用次数: 100

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. Purdy, Y. Bréchet

引用次数: 136

Finite-difference modelling of self-propagating high-temperature synthesis of materials 材料自传播高温合成的有限差分模型

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90173-6

C.R. Bowen , B. Derby

引用次数: 19