Acta Metallurgica et Materialia最新文献_第7页

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 Epub Date: 2003-09-05 DOI: 10.1016/0956-7151(95)90165-5

T. Zhai, J.W. Martin, G.A.D. Briggs

{"title":"Fatigue damage in aluminum single crystals—I. On the surface containing the slip burgers vector","authors":"T. Zhai, J.W. Martin, G.A.D. Briggs","doi":"10.1016/0956-7151(95)90165-5","DOIUrl":"https://doi.org/10.1016/0956-7151(95)90165-5","url":null,"abstract":"<div>An aluminum single crystal with the axial direction of [211&#x0304;0 was fatigued in push-pull at the constant resolved shear stress amplitude 4 MPa, frequency 20 Hz room temperature. Microcracks, microvoids, macrobands, extrusions and intrusions were observed on the side-surface containing the Burgers vector b. Most microcracks were opened, and were within, but approximately perpendicular to, PSBs. Slip steps were found in the extrusions and intrusions. There was net irreversible slip in one direction in most PSBs. Some short cracks along the PSBs on the side-surface were also observed at 5 × 106 cycles. These observations indicate that, without the aid of the surface roughness of PSBs, cracks can still be nucleated, and that, apart from the notch effect of a PSB, there are other factors controlling crack initiation in single crystal aluminium. There may be an internal tensile stress existing in a PSB in the direction of b, and a shear stress applied by the specimen grips in the specimen due to the irreversible slip in one direction in PSBs. These stresses and the applied stress are responsible for the formation of microcracks, microvoids, extrusions, intrusions and macrobands on the side-surface.</div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3813-3825"},"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)90165-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91699222","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: 38

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.c{112} < 111 >单晶变形和织构的影响

Acta Metallurgica et Materialia Pub Date : 1995-10-01 Epub Date: 2003-09-05 DOI: 10.1016/0956-7151(95)90164-7

P. Wagner, O. Engler, K. Lücke

{"title":"Formation of Cu-type shear bands and their influence on deformation and texture of rolled f.c.c. {112}〈111〉 single crystals","authors":"P. Wagner, O. Engler, K. Lücke","doi":"10.1016/0956-7151(95)90164-7","DOIUrl":"https://doi.org/10.1016/0956-7151(95)90164-7","url":null,"abstract":"<div>Microstructural and textural evolution during rolling were investigated in (112)[11<math><mtext>1</mtext></math>] single crystals of Al, Cu and homogenous supersaturated All.9wt%Cu. After a rolling degre of 30% the initial C-orientation (112)[11<math><mtext>1</mtext></math>] of all three materials has rotated towards the so called D-orientation (4411)[1111<math><mtext>8</mtext></math>]. While in the non-shear banding Al the D-orientation remains stable up to high rolling degrees, in the shear banding materials Cu and AlCu it rotates back to the initial C-orientation simultaneously with the formation of shear bands. This orientation change is explained by a rigid body rotation due to the special geometry of a deformation with unidirectional shear bands. With the onset of shear band formation also strong orientation scatterings about tthe transverse direction appear in the pole figures. These scatterings are located inside the shear bands as well as in their vicinity. They are due to the strong shear deformation and the resulting reaction stresses occurring in the shear bands and in their vicinity, respectively.</div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3799-3812"},"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)90164-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91699220","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: 144

Hydrogen induced void nucleation of 310 stainless steel 310不锈钢的氢诱导空洞形核

Acta Metallurgica et Materialia Pub Date : 1995-10-01 Epub Date: 2003-09-05 DOI: 10.1016/0956-7151(95)90156-6

Xing-Gang Jiang , Wu-Yang Chu, Ji-Mei Xiao

引用次数: 11

Directional dependence of corrosion fatigue of iron-silicon bicrystals 铁硅双晶腐蚀疲劳的方向依赖性

Acta Metallurgica et Materialia Pub Date : 1995-10-01 Epub Date: 2003-09-05 DOI: 10.1016/0956-7151(95)90167-1

Jian-Sheng Wang, Sinisa Dj. Mesarovic

引用次数: 16

Fracture behavior of spheroidized hypereutectoid steels 球化过共析钢的断裂行为

Acta Metallurgica et Materialia Pub Date : 1995-10-01 Epub Date: 2003-09-05 DOI: 10.1016/0956-7151(95)90166-3

D.R. Lesuer , C.K. Syn , O.D. Sherby

引用次数: 16

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. Mammoli, M. Bush

引用次数: 19

Directional dependence of corrosion fatigue of iron-silicon bicrystals 铁硅双晶腐蚀疲劳的方向依赖性

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90167-1

Jian-Sheng Wang, S. Mesarovic

引用次数: 16

The thermodynamics of vacancy formation in f.c.c. metals 氟化金属中空位形成的热力学

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90155-8

R. Mclellan, Y. Angel

引用次数: 3

Cracks at mortar-stone interfaces 砂浆-石界面裂缝

Acta Metallurgica et Materialia Pub Date : 1995-10-01 DOI: 10.1016/0956-7151(95)90153-1

D. Tan, E. Tschegg, H. Rotter, H. Kirchner

引用次数: 17

Stability of APB-dissociated 〈111〉 screw superdislocations in B2-ordered structures b2有序结构中apb解离的< 111 >螺旋超位错的稳定性

Acta Metallurgica et Materialia Pub Date : 1995-10-01 Epub Date: 2003-09-05 DOI: 10.1016/0956-7151(95)90161-2

Y.Q. Sun

{"title":"Stability of APB-dissociated 〈111〉 screw superdislocations in B2-ordered structures","authors":"Y.Q. Sun","doi":"10.1016/0956-7151(95)90161-2","DOIUrl":"10.1016/0956-7151(95)90161-2","url":null,"abstract":"<div>The stability of an infinitely long screw 〈111〉 superdislocation dissociated into APB-coupled superpartials on {110}, {112}, or a combination of both, has been analysed under the approximation of linear elasticity theory of dislocations. In the absence of an applied load, the variation of the configurational energy of the dislocation pair in equilibrium has been examined analytically as a function of two basic material parameters, i.e. the elastic anisotropic parameter along 〈111〉M and the ratio of {112} vs {110} APB energies λ = γ112/γ110. It is found that although there is no tor1ue force on the screw partials on both {110} and {112}, the torque force is present at intermediate angular positions and acts in the direction of stabilizing {112} dissociation and destabilizing {110} dissociation. In general dissociation on {112} is favoured energetically if λ > M1/3. Since M > 1 in anisotropic elastic media, ranging from M = 1.09 for FeAl to M = 1.64 for AuCd, favourable {112} dissociation does not require γ112 < γ110. For compounds with <math><mtext>M > 1.22(√</mtext><mtext>3</mtext><mtext>2</mtext><mtext>)</mtext></math>, the screw superdislocation may dissociate into stable non-planar configurations with the APB lying partly on {110} and partly on {112}, forming a locked structure.</div>","PeriodicalId":100018,"journal":{"name":"Acta Metallurgica et Materialia","volume":"43 10","pages":"Pages 3775-3782"},"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)90161-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89853401","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: 14