Research on Superplastic Zn-22Al Alloy with a Large Size to a New Seismic Damper

2011 ◽  
Vol 250-253 ◽  
pp. 773-776
Author(s):  
Ling Jun Kong ◽  
Xue Hua Dong ◽  
Yan Bei Chen ◽  
Xiang Liang Ning ◽  
Jing Tao Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Yield Stress ◽  
Work Hardening ◽  
Room Temperature ◽  
High Ductility ◽  
Seismic Damper ◽  
Large Size

To develop a superplastic damping device, the mechanical properties and superplastic capability of Zn-22Al alloy with a large size in the rolled samples were investigated. It is indicated that the alloy with a large size has some advantage properties, such as high ductility, low yield stress and low work hardening at room temperature, which is very useful to a seismic damper.

The Mechanical Properties of the Superplastic Zn-22Al Alloy at Different Processings

2011 ◽  
Vol 337 ◽  
pp. 354-357
Author(s):  
Ling Jun Kong ◽  
Xue Hua Dong ◽  
Yan Bei Chen ◽  
Xiang Liang Ning ◽  
Jing Tao Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Work Hardening ◽  
Room Temperature ◽  
Air Cooling ◽  
Seismic Damper

To develop a superplastic damper, the mechanical properties of the superplastic Zn-22Al alloy differently processed are studied by the test, at room temperature. It is indicated that the alloy at the air cooling after rolling processing has better mechanical properties at room temperature, such as higher ductility and lower work-hardening, which is very useful to a seismic damper.

Strain Rate Dependence of the Flow Stress and Work-Hardening of Single Crystals of NI3(Al,Hf)B

1994 ◽  
Vol 364 ◽  
Author(s):  
S. S. Ezz ◽  
Y. Q. Sun ◽  
P. B. Hirsch
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Temperature Dependence ◽  
Single Crystals ◽  
Yield Stress ◽  
Strain Rate Sensitivity ◽  
Work Hardening ◽  
Room Temperature ◽  
Rate Sensitivity ◽  
Controlling Mechanism

AbstractThe strain rate sensitivity ß of the flow stress τ is associated with workhardening and β=(δτ/δln ε) is proportional to the workhardening increment τh = τ - τy, where τy is the strain rate independent yield stress. The temperature dependence of β/τh reflects changes in the rate controlling mechanism. At intermediate and high temperatures, the hardening correlates with the density of [101] dislocations on (010). The nature of the local obstacles at room temperature is not established.

Mechanical Properties of an Al-Mg-Sc Alloy Subjected to Intense Plastic Straining

2010 ◽  
Vol 638-642 ◽  
pp. 1952-1958 ◽  
Author(s):  
Rustam Kaibyshev ◽  
Elena Avtokratova ◽  
O.S. Sitdikov
Keyword(s):  
Mechanical Properties ◽  
Cold Rolling ◽  
Yield Stress ◽  
Room Temperature ◽  
Total Elongation ◽  
Warm Rolling ◽  
Ultimate Stress ◽  
Angular Pressing ◽  
Ultrafine Grained ◽  
High Reduction

Effect of intense plastic straining on rollability and service properties of an Al-6%Mg-0.3%Sc alloy was examined. Ultrafine-grained structure (UFG) was produced by equal-channel angular pressing (ECAP) to a strain of 8 at a temperature of 325oC. The formation of UFG structure resulted in increase in the yield stress from 223 MPa to 285 MPa and ultimate stress from 350 MPa to 389 MPa in comparison with initial hot extruded condition. Total elongation slightly decreased from 33% to 29%. After ECAP, the material was subjected to cold and isothermal warm rolling. The formation of UFG structure resulted in enhanced rollability of the present alloy at room temperature. Cold rolling with high reduction provides the development of heavily deformed microstructure with high dislocation density, while the isothermal warm rolling does not remarkably affect the microstructure produced by ECAP. The mechanical properties after ECAP and ECAP with subsequent isothermal rolling were roughly similar. In contrast, cold rolling to the same strain resulted in significant increase of yield stress (495 MPa) and ultimate stress (536 MPa). Total elongation attained was 13%.

Radiation Hardening and Plastic Instability in Neutron Irradiated CuCrZr

2001 ◽  
Vol 683 ◽  
Author(s):  
Dan. J. Edwards ◽  
Bachu. N. Singh
Keyword(s):  
Mechanical Properties ◽  
Yield Strength ◽  
Yield Stress ◽  
Yield Point ◽  
Work Hardening ◽  
Plastic Instability ◽  
Tensile Behavior ◽  
Radiation Hardening ◽  
Post Irradiation ◽  
Microstructure And Mechanical Properties

ABSTRACTThe effect of post-irradiation annealing at 300°C for 50 hours on the microstructure and mechanical properties of CuCrZr irradiated to 0.3 dpa at 100°C has been evaluated. The post- irradiation annealing restores some ductility and work hardening to the material as well as lowers the yield strength, however it does not completely remove the effects of irradiation. A comparison of the microstructural features and mechanical properties in the as-irradiated condition and in the post-irradiation annealed case highlights the fact that the observed microstructure does not necessarily correlate with the changes in tensile behavior, most notably in the removal of the yield point and lowering of the yield stress after annealing.

Microstructure and Mechanical Properties of Ll2-Structure Alloys Based on Al3Zr

1988 ◽  
Vol 133 ◽  
Author(s):  
J. H. Schneibel ◽  
W. D. Porter
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Yield Stress ◽  
Brittle Material ◽  
Room Temperature ◽  
Kirkendall Effect ◽  
Microstructure And Mechanical Properties

ABSTRACTThe tetragonal compound Al3Zr can be transformed into the cubic Ll2 structure by additions of Cr, Fe, Ni or Cu. This result is interpreted in terms of Pettifor's structure map. The transformation is accompanied by substantial softening. The significant porosity of cast buttons which develops during the homogenization required to produce the Ll2 structure is attributed to the Kirkendall effect. Al-5.5Fe-25Zr (at. %) specimens with the Ll2 structure can be deformed at room temperature in compression, and their yield stress has been determined as a function of temperature. Al-Fe-Zr is nevertheless a brittle material. This is illustrated for Al-Fe-V-Zr Ll2-structure compound, the fracture toughness of which is only slightly higher than that of sintered SiC. Evidence is presented to suggest that Ll2 formation is accompanied by an increase in toughness. Significant improvements in the mechanical properties of Al3Zr-type alloys may possibly be achieved by improved processing.

Microstructure and Mechanical Properties of Mechanically Alloyed NiAl

1990 ◽  
Vol 213 ◽  
Author(s):  
S. J. Hwang ◽  
P. Nash ◽  
M. Dollar ◽  
S. Dymek
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Dislocation Density ◽  
Work Hardening ◽  
Room Temperature ◽  
Hot Extrusion ◽  
Homogeneous Distribution ◽  
Mechanically Alloyed ◽  
Oxide Particles ◽  
Temperature Work

ABSTRACTMechanical alloying (MA) has been used to produce NiAl powders from either elemental or prealloyed constituents. The powders were consolidated by hot extrusion resulting in material which was fully dense, with a grain size around 1 μm and a homogeneous distribution of oxide particles with sizes in the range 10 to 100 nm. TEM observation indicates the presence of a significant dislocation density after consolidation. Mechanical properties have been studied by compression testing from room temperature to 1300 K in air. Yield strengths ranged from 1453 MPa to 32 MPa depending on material and test temperature. Work hardening was observed at all test temperatures for both materials. Substantial ductility was observed even at room temperature where it exceeds 7.5 %. The effects of microstructure on the mechanical properties are discussed.

Solid-state recycling for machined chips of iron by hot extrusion and annealing

2004 ◽  
Vol 19 (5) ◽  
pp. 1524-1530 ◽  
Author(s):  
Yasumasa Chino ◽  
Hajime Iwasaki ◽  
Mamoru Mabuchi
Keyword(s):  
Solid State ◽  
Dislocation Density ◽  
Yield Stress ◽  
Grain Refinement ◽  
Pure Iron ◽  
Room Temperature ◽  
Hot Extrusion ◽  
Low Energy ◽  
High Dislocation Density ◽  
High Ductility

Solid-state recycling for machined chips of pure iron by hot extrusion at 823 K and annealing at 1073–1273 K was carried out. The as-extruded solid recycled specimen without annealing was fractured prior to yielding at room temperature. However, high ductility was recovered by annealing at 1073–1273 K. This is because the oxides at the interface of the machined chips dispersed in grain by annealing. The annealed solid recycled specimens showed higher yield stress than the annealed virgin extruded specimens. Grain refinement for the solid recycled specimens was enhanced by the high dislocation density in the machined chips, resulting in higher strength in the recycled specimens. Thus, the solid-state recycling is a low energy upgrade recycle process.

Influence of the structure on the mechanical properties of electrodeposited metallic thin films

1993 ◽  
Vol 308 ◽  
Author(s):  
J.-L. Delplancke ◽  
R. Winand ◽  
J. Dille ◽  
J. Charlier
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Crystal Growth ◽  
Work Hardening ◽  
Room Temperature ◽  
Ageing Process ◽  
Metallic Thin Films ◽  
X Ray Diffraction ◽  
Stress Strain ◽  
X Ray

ABSTRACTProduction of thin (10 to 200 microns thick) metallic (Cu, Co and Ni-P) foils is performed by electrodeposition on various substrates. A competition between substrate-induced and electroplating-induced inhibition of crystal growth appears. Film structures observed by SEM, TEM and X-Ray diffraction are related to the mechanical properties of the films (stress-strain curves, microhardness and work hardening bend test).In some cases, copper thin films with a large number of submicron crystals are obtained. These films recrystallize at room temperature and their mechanical properties are completely modified by this ageing process.

Dislocation Structures and Anomalous Yielding in Ordered Alloys

1990 ◽  
Vol 213 ◽  
Author(s):  
P. M. Hazzledine ◽  
Y. Q. Sun
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Strain Rate ◽  
Yield Stress ◽  
Work Hardening ◽  
Screw Dislocations ◽  
Ordered Alloys ◽  
Work Hardening Rate ◽  
Initial Work ◽  
Edge Dislocations

ABSTRACTThe strain, strain rate and temperature dependencies of the yield stresses of the model L12 materials Ni3Al, Ni3Ga and Co3Ti are described, as well as two associated properties, the initial work-hardening rate and the inverted creep. These mechanical properties, the electron microscope observations of <110> {111} APB coupled slip and the violations of Schmid's laws point to glissile-sessile-glissile transitions by cross slip of screw dislocations as the explanation for the yield stress anomaly. Similar explanations are probable for h.c.p. Be, B2 CoTi and tetragonal TiAl and MoSi2. A different kind of model, based on the behavior of edge dislocations is required for h.c.p. Mg, B2 CuZn and DO19 Ti3Al.

Sign in / Sign up

Export Citation Format

Share Document