scholarly journals Effect of Sc addition on the age-hardening and precipitation behavior of Al-2.5mass%Cu alloy.

1996 ◽  
Vol 46 (6) ◽  
pp. 275-279 ◽  
Author(s):  
Masaru NAKAYAMA ◽  
Yasuhiro MIURA
Keyword(s):  
Age Hardening ◽  
Precipitation Behavior ◽  
Cu Alloy ◽  
Sc Addition

Precipitation in Al-Li-Cu Alloys

1981 ◽  
Vol 39 ◽  
pp. 44-45
Author(s):  
J. E. O'Neal ◽  
K. K. Sankaran
Keyword(s):  
Electron Microscopy ◽  
Age Hardening ◽  
Precipitation Behavior ◽  
Zone Formation ◽  
Specific Strength ◽  
Hardening Behavior ◽  
Cu Alloys ◽  
High Specific Strength ◽  
Transmission Electron ◽  
Structural Applications

Al-Li-Cu alloys combine high specific strength and high specific modulus and are potential candidates for aircraft structural applications. As part of an effort to optimize Al-Li-Cu alloys for specific applications, precipitation in these alloys was studied for a range of compositions, and the mechanical behavior was correlated with the microstructures.Alloys with nominal compositions of Al-4Cu-2Li-0.2Zr, Al-2.5Cu-2.5Li-0.2Zr, and Al-l.5Cu-2.5Li-0.5Mn were argon-atomized into powder at solidification rates ≈ 103°C/s. Powders were consolidated into bar stock by vacuum pressing and extruding at 400°C. Alloy specimens were solution annealed at 530°C and aged at temperatures up to 250°C, and the resultant precipitation was studied by transmission electron microscopy (TEM).The low-temperature (≲100°C) precipitation behavior of the Al-4Cu-2Li-0.2Zr alloy is a combination of the separate precipitation behaviors of Al-Cu and Al-Li alloys. The age-hardening behavior at these temperatures is characteristic of Guinier-Preston (GP) zone formation, with additional strengthening resulting from the coherent precipitation of δ’ (Al3Li, Ll2 structure), the presence of which is revealed by the selected-area diffraction pattern (SADP) shown in Figure la.

The coprecipitation of Cr3P and Cr in Cu

1988 ◽  
Vol 46 ◽  
pp. 764-765
Author(s):  
M.J. Witcomb ◽  
U. Dahmen ◽  
K.H. Westmacott
Keyword(s):  
Orientation Relationship ◽  
Interface Structure ◽  
Model System ◽  
Relative Orientation ◽  
Age Hardening ◽  
Precipitation Behavior ◽  
Solution Treated ◽  
Small Needle ◽  
Diffraction Patterns ◽  
Interface Structures

Cu-Cr age-hardening alloys are of interest as a model system for the investigation of fcc/bcc interface structures. Several past studies have investigated the morphology and interface structure of Cr precipitates in a Cu matrix (1-3) and good success has been achieved in understanding the crystallography and strain contrast of small needle-shaped precipitates. The present study investigates the effect of small amounts of phosphorous on the precipitation behavior of Cu-Cr alloys.The same Cu-0.3% Cr alloy as was used in earlier work was rolled to a thickness of 150 μm, solution treated in vacuum at 1050°C for 1h followed by quenching and annealing for various times at 820 and 863°C.Two laths and their corresponding diffraction patterns in an alloy aged 2h at 820°C are shown in correct relative orientation in Fig. 1. To within the limit of accuracy of the diffraction patterns the orientation relationship was that of Kurdjumov-Sachs (KS), i.e. parallel close-packed planes and directions.

Precipitation behavior of an Fe-1.03 wt.% Cu alloy

2004 ◽  
Vol 95 (1) ◽  
pp. 57-59 ◽  
Author(s):  
W. Mao ◽  
H. Ren ◽  
Y. Yu
Keyword(s):  
Precipitation Behavior ◽  
Cu Alloy

scholarly journals Effect of pre-deformation on age-hardening behaviors in an Al-Mg-Cu alloy

2021 ◽  
pp. 141557
Author(s):  
Xuanliang Chen ◽  
Daehan Kim ◽  
Minho O ◽  
Calin D. Marioara ◽  
Sigmund J. Andersen ◽  
...  
Keyword(s):  
Age Hardening ◽  
Cu Alloy

Influence of Sc Addition on Precipitation Behavior and Properties of Al-Cu-Mg Alloy

2021 ◽  
Author(s):  
Xiangbin Han ◽  
Shuangbao Wang ◽  
Bo Wei ◽  
Shuai Pan ◽  
Guizhen Liao ◽  
...  
Keyword(s):  
Mg Alloy ◽  
Precipitation Behavior ◽  
Sc Addition

Effects of Zn addition on the age hardening behavior and precipitation evolution of an Al-Mg-Si-Cu alloy

2018 ◽  
Vol 145 ◽  
pp. 258-267 ◽  
Author(s):  
Shang Zhu ◽  
Zhihui Li ◽  
Lizhen Yan ◽  
Xiwu Li ◽  
Shuhui Huang ◽  
...  
Keyword(s):  
Age Hardening ◽  
Hardening Behavior ◽  
Cu Alloy ◽  
Zn Addition

Effect of Ag addition on the age hardening and precipitation behavior in an Al-Cu-Li-Mg-Zn-Mn-Zr alloy

2020 ◽  
Vol 162 ◽  
pp. 110184
Author(s):  
Bo Jiang ◽  
Haisheng Wang ◽  
Danqing Yi ◽  
Yu Tian ◽  
Fanghua Shen ◽  
...  
Keyword(s):  
Age Hardening ◽  
Precipitation Behavior ◽  
Ag Addition ◽  
Zr Alloy

Three Strategies to Achieve Concurrent Strengthening by Ultrafine-Grained and Precipitation Hardenings for Severely Deformed Age-Hardnable Aluminum Alloys

2016 ◽  
Vol 1135 ◽  
pp. 161-166 ◽  
Author(s):  
Shoichi Hirosawa ◽  
Yong Peng Tang ◽  
Zenji Horita ◽  
Seung Won Lee ◽  
Kenji Matsuda ◽  
...  
Keyword(s):  
Aluminum Alloys ◽  
Volume Fraction ◽  
High Pressure Torsion ◽  
Equivalent Strain ◽  
Age Hardening ◽  
Cu Alloy ◽  
Ultrafine Grained ◽  
Δ Phase ◽  
Microalloying Elements ◽  
Wrought Aluminum Alloys

In this paper, comprehensive studies on the age-hardening behavior and precipitate microstructures of severely deformed and then artificially aged aluminum alloys have been conducted to clarify whether or not concurrent strengthening by ultrafine-grained and precipitation hardenings can be achieved. From our graphically-illustrated equivalent strain dependence of both the attained hardness and increment/decrement in hardness during aging (i.e. age-hardenability), three strategies to maximize the combined processing of severe plastic deformation and age-hardening technique are proposed. (1) Lowering of aging temperature and (2) utilization of microalloying elements can improve not only the attained hardness but also the age-hardenability of high-pressure torsion (HPT) specimens of Al-Mg-Si (-Cu) alloy due to the increased volume fraction of transgranular precipitates. A further increase in hardness can be achieved by (3) taking advantage of spinodal decomposition for HPTed Al-Li-Cu alloy, in which nanoscale precipitates of δ’ phase are successfully formed within ultrafine grains, irrespective of the higher number density of grain boundaries. The attained hardness of >HV290 in the latter alloy is almost the highest among conventional wrought aluminum alloys, and therefore our proposed strategies will be useful for designing concurrently strengthened severely-deformed age-hardenable aluminum alloys.

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