Decomposition of β-phase in the Heusler alloy Cu2.00Mn1.00Al1.00

Kozubski, R.; Sołtys, J.

doi:10.1007/bf00752258

Cited by 36 publications

(31 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[14,15] THE as-quenched microstructures of the Cu 3Ϫx Mn x Al When the aging temperature was kept in the range from 460 (0.5 Ϲ x Ϲ 1) alloys have been studied by many workers. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] ЊC to 650 ЊC, ␤-Mn precipitates started to appear within the In their studies, it is seen that when the Cu 3Ϫx Mn x Al alloys matrix. [9,[15][16][17] The ␤-Mn precipitate has an A13 (simple with 0.5 Ϲ x Ϲ 0.8 were solution heat treated at a point in cubic) structure with lattice parameter a ϭ 0.641 nm.…”

Section: Introductionmentioning

confidence: 99%

“…[9,10] The orientation relationship between the ␥-brass and the matrix was cubic to cubic. [14,15] THE as-quenched microstructures of the Cu 3Ϫx Mn x Al When the aging temperature was kept in the range from 460 (0.5 Ϲ x Ϲ 1) alloys have been studied by many workers.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12][13][14][15] The aging processes were performed at temperatures ranging Figure 2(e) is a DF electron micrograph taken with the reflection spot marked as 1 in Figure 2(b), revealing the presence of the extremely fine L-J precipitates. On the basis of the preceding observations, it is concluded that the microstructure of the alloy in the as-quenched condition is L2 1 phase containing extremely fine L-J precipitates.…”

Section: Introductionmentioning

confidence: 99%

“…[9,[15][16][17] The ␤-Mn precipitate has an A13 (simple with 0.5 Ϲ x Ϲ 0.8 were solution heat treated at a point in cubic) structure with lattice parameter a ϭ 0.641 nm. [9] the single ␤ phase (disordered body-centered cubic) region…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Orientation relationship between β-Mn and L21 matrix in a Cu2MnAl alloy

Chu

Liu

1999

Metall Mater Trans A

View full text Add to dashboard Cite

In the as-quenched condition, the microstructure of the Cu 2 MnAl alloy was L2 1 phase containing extremely fine L-J precipitates. This result is different from that reported by other workers in the asquenched Cu 2 MnAl alloy. When the as-quenched alloy was aged at 350 ЊC, ␥-brass precipitates started to appear within the L2 1 matrix. The orientation relationship between the ␥ -brass and the L2 1 matrix was determined to be cubic to cubic. This result is consistent with that observed by other workers in the aged Cu-Mn-Al alloy. When the alloy was aged at 460 ЊC, the ␥ -brass precipitates disappeared and platelike ␤ -Mn precipitates occurred within the L2 1 matrix. As the aging temperature was increased to 560 ЊC, the morphology of the ␤-Mn precipitates changed from platelike to granular shape. Electron diffraction examinations indicated that in spite of the morphology change the same orientation relationship between the ␤-Mn and the L2 1 matrix is maintained, and it could be best stated as follows: (210) ␤-Mn //(100) m , (120) ␤-Mn //(010) m , (001) ␤-Mn //(001) mThis result is in disagreement with that reported by Kuzobski et al. in the aged Cu 2 MnAl alloy. In their study, it was concluded that both the morphology of the ␤ -Mn precipitates and the orientation relationship between the ␤ -Mn and the L2 1 matrix would vary with the aging temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Orientation relationship between β-Mn and L21 matrix in a Cu2MnAl alloy

Chu

Liu

1999

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…The relaxation times of both processes significantly differed, but the related activation energies (reaching 4.6 eV) were nearly equal [1].…”

Section: Introduction and General Assumptionsmentioning

confidence: 89%

Kinetics of "order-order" Relaxations in Ni₃Al Studied by Computer Simulation

et al. 1999

Self Cite

View full text Add to dashboard Cite

The experimental investigations of "order-order" kinetics in Ni3 Al-based L1 2 -ordered intermetallic compounds revealed the relaxation curves composed of two parallel processes considerably differing in relaxation rates. A simple Ising-type model based on a vacancy mechanism of atomic jumps was used to carry the Monte Carlo simulations of long-range-order relaxations m a binary A3 B system with L1 2 -type superstructure. The simulated relaxation curves fitted weighted sums of two exponentials with significantly different relaxation times. It was found out that the fast relaxation process is controlled by the dynamics of the minority B-atom jumps.

show abstract

Study of kinetics of phase transitions in the CuMnAl alloys

Sołtys

Kozubski

Meres

et al. 1985

Cryst. Res. Technol.

View full text Add to dashboard Cite

The alloys of the system Cu-Mn-A1 have been extensively investigated. The results of systeniatic studies of phase equilibria in those alloys have been recapitulated by WEST, THOMAS, and by KOSTER, GODECKE. However, the alloys of the composition approximating Cu,MnAl have been drawing special attention.At high temperatures the alloys of such composition are comprised in a range of eyuili-I)riritti of the @-phase which has siniple crystalline structure and is often called the Heusler ~ihase. The ~iroperties of the above alloys a.re very interesting due to the siiiiultaneous occicrrence of two kinds of structural phase transitions: the "order-disorder" ttansforiiiations in tlic range of /3-phase and the decotnposition of the @-phase in the teinperature range of its riletastability. It was indicated that ahove 1050 K the @-phase has cubic disordered structure of the type A2 while, when cooled, it transforms a t 1050 K into ptwtially ordered B2-type structure and at ahout 950 K into completely ordered L2,-type one, DUBOIS (LISSE).On the other hand, the @-phase is inetastable a t teniperatures below 970 K and decom-1)oses into three phases of the types BRlx, y-Crt9Al, and T-Cu,Mn,AI (WEST, THOMAS; KGSTER, GODECKE).The siinriltaneous occurrence of the ordering and decomposition processes may be an interesting subject of theoretical considerations (NISHIZAWA et al.). The processes tnay be corisitlered either on microscopic level requiring various simplifying assiiiiiptions or through the stridy of processes of precipitation in real structicre. Thc aiin of tho presented work was the detailed research of the process of deconi1)osition of @-phase in the stoichiotnetric alloy Cu,MnAl (KOZUBSKI et 81. 1982, 1983a, 11, c). During t h e investigations the methods of X-ray diffraction and the measureinent of electrical resistivity as well as electron microprobe were applied. The X-ray diffraction and riiicroprobe tiieasurements were performed a t room tempmature antl the specimens quenched i n water after the desired annealing were examined. All samples of the alloy were a t first Iiotilogenizetl a t 1123 K and then annealed a t various temperatures between 423 antl 973 K . Figure 1 shows the results of quantitative X-ray diffraction analysis of the samples annealed isothermally at fi33, 733 and 843 K (Figs la--c) and aged isochronally for 24 h between 423 and 973 K (Fig. Id). It is visible that the kinetics of the reaction a t 733 K arid 833 K differed strongly from those taking place at 633 K. While a t 633 K single process was observed, a t 733 and 833 K the decomposition of @ phase proceeded in two stages. At first rapid precipitation of B-Mn was accompanied by the decay of B-phase and the simultaneous formation of a new phase called @' isostructriral with the @-phase, however, with the reduced lattice parameter. This process was followed by slow decomposition of the @'-phase into y-Cu,Al, and T-Cu,Mn,Al. The rate of the latter process was strongly decreased when the annealing temperature was increased.The investigation of t...

show abstract

Decomposition of β-phase in the Heusler alloy Cu2.00Mn1.00Al1.00

Cited by 36 publications

References 8 publications

Orientation relationship between β-Mn and L21 matrix in a Cu2MnAl alloy

Orientation relationship between β-Mn and L21 matrix in a Cu2MnAl alloy

Kinetics of "order-order" Relaxations in Ni₃Al Studied by Computer Simulation

Study of kinetics of phase transitions in the CuMnAl alloys

Contact Info

Product

Resources

About

Decomposition of β-phase in the Heusler alloy Cu2.00Mn1.00Al1.00

Cited by 36 publications

References 8 publications

Orientation relationship between β-Mn and L21 matrix in a Cu2MnAl alloy

Orientation relationship between β-Mn and L21 matrix in a Cu2MnAl alloy

Kinetics of "order-order" Relaxations in Ni3Al Studied by Computer Simulation

Study of kinetics of phase transitions in the CuMnAl alloys

Contact Info

Product

Resources

About

Kinetics of "order-order" Relaxations in Ni₃Al Studied by Computer Simulation