Acta Metallurgica最新文献_第2页

Neutron irradiation-induced intergranular solute segregation in iron base alloys 中子辐照诱导铁基合金晶间溶质偏析

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90201-0

J. Kameda, A.J. Bevolo

{"title":"Neutron irradiation-induced intergranular solute segregation in iron base alloys","authors":"J. Kameda, A.J. Bevolo","doi":"10.1016/0001-6160(89)90201-0","DOIUrl":"10.1016/0001-6160(89)90201-0","url":null,"abstract":"<div>The effect of neutron irradiation (9.4 × 1022 n/m2 at 395°C) on solute segregation to grain or interfacial boundaries in several iron base alloys doped with P, Cu and/or C has been investigated using scanning Auger microscopy. It was found by fracture surface Auger analyses that while neutron irradiation enhanced intergranular segregation of S in a Cu-doped alloy with the absence of P segregation, it mitigated S segregation and promoted P segregation in P containing alloys. The quantity of segregated P was much greater for the irradiated alloys than for the thermally 1000 h aged alloys. The P-doped alloy showed a stronger effect of neutron irradiation on the enrichment of P segregation than the P-Cu-doped and P-C-doped alloys. Argon sputtering experiments indicated that the segregation profiles for S and P were more broadly and narrowly distributed during irradiation, respectively. A remarkable transition of the P segregation profile was observed near the interface of particles lying along grain boundaries where S was preferentially segregated because of the competitive segregation between S and P. The mechanism for neutron irradiation-induced solute segregation is discussed in light of inverse Kirkendall effects and the formation of defect-solute complexes arising from the dynamic interaction between solute and defect fluxes. The relationship of intergranular solute segregation to embrittlement is presented.</div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 12","pages":"Pages 3283-3296"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90201-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74190536","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: 27

Laser surface alloying of ni film on al-based alloy 铝基合金上ni薄膜的激光表面合金化

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90192-2

E. Gaffet , J.M. Pelletier , S. Bonnet-Jobez

引用次数: 0

Rapid solidification of Al-Cu eutectic alloy by laser remelting 激光重熔Al-Cu共晶合金的快速凝固

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90203-4

M. Zimmermann , M. Carrard , W. Kurz

{"title":"Rapid solidification of Al-Cu eutectic alloy by laser remelting","authors":"M. Zimmermann , M. Carrard , W. Kurz","doi":"10.1016/0001-6160(89)90203-4","DOIUrl":"10.1016/0001-6160(89)90203-4","url":null,"abstract":"<div>Rapid surface resolidification using a high powered CO2-laser has been performed on eutectic Al-32.7 wt% Cu at speeds between 0.2 and 8 m/s. By means of longitudinal cuts through the centre of the laser trace, the local growth rate has been measured by observation of the orientation of the microstructure using transmission electron microscopy. The various microstructures as a function of growth rate, are: <ul><li>1.(a) regular lamellar eutectic α-Al/θ-Al2Cu structure for growth rates below 20 cm/s with interlamellar spacing as fine as 17 nm;</li><li>2.(b) a new wavy eutectic α-Al/θ'-Al2Cu morphology for growth rates of between 20 and 50 cm/s;</li><li>3.(c) a banded structure formed by alternating supersaturated α-Al solid solution and the wavy eutectic for growth rates greater than 50 cm/s.</li></ul> A recent analytical model for eutectic growth under rapid solidification condition is compared to the experimental results. Contrary to the classical λ2Vs = const. relationship, which predicts a continuous decrease in spacing as the growth rate increases, this new theoretical model clearly predicts a limit for the coupled eutectic growth which finds its analogy in single phase solidification in the limit of absolute stability.</div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 12","pages":"Pages 3305-3313"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90203-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85879199","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: 187

Temperature and rate dependence of saturation stress for low amplitude fatigue of Cu crystals between 4.2 and 350 K Cu晶体在4.2 ~ 350 K范围内低振幅疲劳饱和应力的温度和速率依赖性

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90198-3

Z.S. Basinski, S.J. Basinski

引用次数: 29

The geometry of glide in Ni3Al at temperatures above the flow stress peak 温度高于流动应力峰值时Ni3Al滑动的几何形状

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90195-8

P.M. Hazzledine , M.H. Yoo , Y.Q. Sun

{"title":"The geometry of glide in Ni3Al at temperatures above the flow stress peak","authors":"P.M. Hazzledine , M.H. Yoo , Y.Q. Sun","doi":"10.1016/0001-6160(89)90195-8","DOIUrl":"10.1016/0001-6160(89)90195-8","url":null,"abstract":"<div>At temperatures above the flow stress peak in Ni3Al the slip system is 〈110〉{001}. At higher temperatures still a second system, 〈010〉{001}, also operates. Both types of dislocation form glide loops which dissociate into <math><mtext>1</mtext><mtext>2</mtext></math> 〈110〉 APB-linked partials and both glide loops show ranges of elastic instability. Three types of dislocation may lower their energy further by a second dissociation on {111} planes: the screw 〈110〉 forms a Kear-Wilsdorf lock, the edge 〈110〉 forms a Lomer-Cottrell lock and the 45° 〈010〉 forms a B5 lock. Interactions between 〈110〉 and 〈010〉 dislocations give rise to two more dislocations with non-planar cores, the 〈110〉 lock and the 〈111〉 lock. All these locked dislocations are slow moving or immobile and all, except for the 〈111〉 lock, have been observed in the electron microscope. The formation of 〈110〉 and 〈111〉 locks and the mixing of the two slip systems through interactions between them give an explanation for the high-temperature work-hardening peak found in Ni3Al.</div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 12","pages":"Pages 3235-3244"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90195-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82431740","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: 29

Diffusion induced grain boundary migration in Ni-Cu Diffusion couples Ni-Cu扩散偶的扩散诱导晶界迁移

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90209-5

D. Liu, W.A. Miller, K.T. Aust

{"title":"Diffusion induced grain boundary migration in Ni-Cu Diffusion couples","authors":"D. Liu, W.A. Miller, K.T. Aust","doi":"10.1016/0001-6160(89)90209-5","DOIUrl":"10.1016/0001-6160(89)90209-5","url":null,"abstract":"<div>Diffusion induced grain boundary migration (DIGM) was investigated in the Ni substrate of Ni-Cu diffusion couples. After annealing at 615°C for 26 h, TEM/STEM revealed: <ul><li>1.(1) dislocation walls at the initial grain boundary positions,</li><li>2.(2) a small misorientation (0.1–0.5°) between the DIGM zone and the Ni matrix,</li><li>3.(3) highest Cu concentrations in the DIGM zones adjacent to the original grain boundary positions,</li><li>4.(4) steps and line defects at the DIGM boundaries and</li><li>5.(5) grain boundary faceting caused by DIGM.</li></ul> After 92 h of annealing at 615°C, two major changes were observed as compared with the shorter 26 h anneal at the same temperature: <ul><li>1.(1) a decrease in the dislocation densities in the DIGM zones, in the matrix and at the original grain boundary positions</li><li>2.(2) a change in Cu concentration profiles across the DIGM zones. The experimental results are interpreted in terms of current DIGM theories.</li></ul></div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 12","pages":"Pages 3367-3378"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90209-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81174272","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: 43

Elastic anisotropy and the substitutional bainite formation in copper base alloys 铜基合金中弹性各向异性与取代贝氏体的形成

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90186-7

A. Schmitz, M. Chandrasekaran , G. Ghosh , L. Delaey

引用次数: 13

On crack path selection and the interface fracture energy in bimaterial systems 双材料体系中裂纹路径选择与界面断裂能

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90197-1

A.G. Evans , B.J. Dalgleish , M. He , J.W. Hutchinson

引用次数: 127

Overview no. 86 概述。86

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90184-3

P.H. Leo , R.F. Sekerka

{"title":"Overview no. 86","authors":"P.H. Leo , R.F. Sekerka","doi":"10.1016/0001-6160(89)90184-3","DOIUrl":"10.1016/0001-6160(89)90184-3","url":null,"abstract":"<div>The effect of surface stress on the equilibrium conditions at crystal-melt, coherent crystal-crystal and greased crystal-crystal interfaces is investigated by using a variational method to test for equilibrium. In all three cases, the interface between the phases is modelled as a Gibbsian dividing surface, and the excess internal energy associated with the interface is allowed to depend on both the deformation of the interface and the crystallographic normal to the interface. The position of an interface can vary due to both deformation at the interface and transformation between the two phases at the interface (accretion), and so we define a special variation that accounts for both. Thus, surface stress appears explicitly in both the force and energy balances at crystal-melt and coherent crystal-crystal interfaces. In particular, an interfacial strain energy term appears in the energy balance at these interfaces; this term gives the energy of deforming the interface against the force associated with the surface stress, and is a new result from this analysis. Anisotropy also appears in this energy balance through a term that can be expressed by using Cahn and Hoffman's ξ-vector. Finally, it is shown that a greased crystal-crystal system differs from crystal-melt and coherent crystal-crystal systems in that two independent deformations and crystallographic normals can be defined at a greased interface. However, by partitioning the excess energy associated with a greased interface between these deformations and normals, one can reduce the equilibrium conditions at a greased interface to those that obtain if the two crystals would interact only through a thin fluid layer at the interface.</div>","PeriodicalId":6969,"journal":{"name":"Acta Metallurgica","volume":"37 12","pages":"Pages 3119-3138"},"PeriodicalIF":0.0,"publicationDate":"1989-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0001-6160(89)90184-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86791174","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: 151

Deformation of crack-bridging ductile reinforcements in toughened brittle materials 增韧脆性材料中裂纹桥接韧性增强的变形

Acta Metallurgica Pub Date : 1989-12-01 Epub Date: 2003-06-11 DOI: 10.1016/0001-6160(89)90207-1

P.A. Mataga

引用次数: 158