J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (12): 1332-1338.DOI: 10.1016/j.jmst.2016.11.005
• Orginal Article • Previous Articles Next Articles
Han X.B.1,2,Qian Y.1,*(),Liu W.1,Chen D.M.2,Yang K.2
Received:
2015-07-24
Accepted:
2015-11-05
Online:
2016-12-20
Published:
2017-02-16
Contact:
Qian Y.
Han X.B.,Qian Y.,Liu W.,Chen D.M.,Yang K.. Effect of Preparation Technique on Microstructure and Hydrogen Storage Properties of LaNi3.8Al1.0Mn0.2 Alloys[J]. J. Mater. Sci. Technol., 2016, 32(12): 1332-1338.
Fig. 1. Cross-section of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques: (a) as-cast; (b) cast then annealed at 1223 K; (c) as-spun; (d) spun then annealed at 1223 K.
Fig. 2. Phase distribution of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques: (a) as-cast; (b) cast then annealed at 1223 K; (c) as-spun; (d) spun then annealed at 1223 K.
Fig. 3. Phase composition of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques: (a) as-cast; (b) cast then annealed at 1223 K; (c) as-spun; (d) spun then annealed at 1223 K.
Alloy | Spot | Element content (at.%) ------------------ | Formulate | Phase | |||
---|---|---|---|---|---|---|---|
La | Ni | Al | Mn | ||||
As-cast | A1 | 17.18 | 62.02 | 17.79 | 3.01 | La(Ni3.771Al1.024Mn0.205)0.964 | LaNi5 |
B1 | 34.33 | 49.56 | 13.69 | 2.42 | LaNi1.444Al0.399Mn0.070 | LaNi2 | |
C1 | 25.3 | 49.33 | 24.2 | 1.17 | LaNi1.950Al0.957Mn0.046 | LaNi3 | |
D1 | 0.09 | 51.55 | 38.79 | 9.57 | La0.002NiAl0.752Mn0.186 | AlNi | |
Cast then annealed at 1223 K | A2 | 17.42 | 61.54 | 17.6 | 3.44 | La(Ni3.712Al1.078Mn0.209)0.954 | LaNi5 |
B2 | 47.42 | 48.03 | 4.23 | 0.32 | LaNi1.013Al0.089Mn0.007 | LaNi | |
C2 | 25.51 | 49.44 | 24.15 | 0.89 | LaNi1.938Al0.947Mn0.035 | LaNi3 | |
D2 | 0.22 | 51.15 | 39.33 | 9.3 | La0.004NiAl0.769Mn0.182 | AlNi | |
As-spun | A3 | 17.27 | 61.45 | 17.81 | 3.46 | La(Ni3.714Al1.077Mn0.209)0.948 | LaNi5 |
B3 | 43.88 | 50.52 | 4.95 | 0.66 | LaNi1.151Al0.113Mn0.015 | LaNi | |
C3 | 25.65 | 50.88 | 22.25 | 1.22 | LaNi1.984Al0.867Mn0.048 | LaNi3 | |
D3 | 8.65 | 53.05 | 31.02 | 7.27 | La0.163NiAl0.585Mn0.137 | AlNi | |
Spun then annealed at 1223 K | A4 | 16.84 | 64.17 | 16.07 | 2.92 | La(Ni3.858Al0.966Mn0.176)0.988 | LaNi5 |
Table 1. Constituents of different phase of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques
Alloy | Spot | Element content (at.%) ------------------ | Formulate | Phase | |||
---|---|---|---|---|---|---|---|
La | Ni | Al | Mn | ||||
As-cast | A1 | 17.18 | 62.02 | 17.79 | 3.01 | La(Ni3.771Al1.024Mn0.205)0.964 | LaNi5 |
B1 | 34.33 | 49.56 | 13.69 | 2.42 | LaNi1.444Al0.399Mn0.070 | LaNi2 | |
C1 | 25.3 | 49.33 | 24.2 | 1.17 | LaNi1.950Al0.957Mn0.046 | LaNi3 | |
D1 | 0.09 | 51.55 | 38.79 | 9.57 | La0.002NiAl0.752Mn0.186 | AlNi | |
Cast then annealed at 1223 K | A2 | 17.42 | 61.54 | 17.6 | 3.44 | La(Ni3.712Al1.078Mn0.209)0.954 | LaNi5 |
B2 | 47.42 | 48.03 | 4.23 | 0.32 | LaNi1.013Al0.089Mn0.007 | LaNi | |
C2 | 25.51 | 49.44 | 24.15 | 0.89 | LaNi1.938Al0.947Mn0.035 | LaNi3 | |
D2 | 0.22 | 51.15 | 39.33 | 9.3 | La0.004NiAl0.769Mn0.182 | AlNi | |
As-spun | A3 | 17.27 | 61.45 | 17.81 | 3.46 | La(Ni3.714Al1.077Mn0.209)0.948 | LaNi5 |
B3 | 43.88 | 50.52 | 4.95 | 0.66 | LaNi1.151Al0.113Mn0.015 | LaNi | |
C3 | 25.65 | 50.88 | 22.25 | 1.22 | LaNi1.984Al0.867Mn0.048 | LaNi3 | |
D3 | 8.65 | 53.05 | 31.02 | 7.27 | La0.163NiAl0.585Mn0.137 | AlNi | |
Spun then annealed at 1223 K | A4 | 16.84 | 64.17 | 16.07 | 2.92 | La(Ni3.858Al0.966Mn0.176)0.988 | LaNi5 |
Alloy | a (nm) | c (nm) | c/a | V (nm3) | e |
---|---|---|---|---|---|
As-cast | 0.50829 | 0.40652 | 0.79978 | 0.090958 | 0.1796% |
Cast then annealed at 1223 K | 0.50992 | 0.40872 | 0.80154 | 0.092035 | 0.0070% |
As-spun | 0.51049 | 0.40806 | 0.79934 | 0.092095 | 0.0578% |
Spun then annealed at 1223 K | 0.51012 | 0.40800 | 0.79981 | 0.091947 | 0.0044% |
Table 2. Lattice parameters and cell volumes of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques
Alloy | a (nm) | c (nm) | c/a | V (nm3) | e |
---|---|---|---|---|---|
As-cast | 0.50829 | 0.40652 | 0.79978 | 0.090958 | 0.1796% |
Cast then annealed at 1223 K | 0.50992 | 0.40872 | 0.80154 | 0.092035 | 0.0070% |
As-spun | 0.51049 | 0.40806 | 0.79934 | 0.092095 | 0.0578% |
Spun then annealed at 1223 K | 0.51012 | 0.40800 | 0.79981 | 0.091947 | 0.0044% |
Alloy | Formulate | (Al + Mn)/Ni | B/A |
---|---|---|---|
As-cast | La(Ni3.771Al1.024Mn0.205)0.964 | 0.326 | 4.82 |
Cast then annealed at 1223 K | La(Ni3.712Al1.078Mn0.209)0.954 | 0.347 | 4.77 |
As-spun | La(Ni3.714Al1.077Mn0.209)0.948 | 0.346 | 4.74 |
Spun then annealed at 1223 K | La(Ni3.858Al0.966Mn0.176)0.988 | 0.296 | 4.94 |
Table 3. Change of B/A and (Al + Mn)/Ni ratio in the matrix of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques
Alloy | Formulate | (Al + Mn)/Ni | B/A |
---|---|---|---|
As-cast | La(Ni3.771Al1.024Mn0.205)0.964 | 0.326 | 4.82 |
Cast then annealed at 1223 K | La(Ni3.712Al1.078Mn0.209)0.954 | 0.347 | 4.77 |
As-spun | La(Ni3.714Al1.077Mn0.209)0.948 | 0.346 | 4.74 |
Spun then annealed at 1223 K | La(Ni3.858Al0.966Mn0.176)0.988 | 0.296 | 4.94 |
Alloy | P (kPa) -------------------- | Sf | |
---|---|---|---|
Absorption | Desorption | ||
As-cast | 75.32 | 62.50 | 0.62 |
Cast then annealed at 1223 K | 37.77 | 35.88 | 0.43 |
As-spun | 36.39 | 33.04 | 0.50 |
Spun then annealed at 1223 K | 41.85 | 39.49 | 0.19 |
Table 4. PCT curve characteristics at 433 K of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques
Alloy | P (kPa) -------------------- | Sf | |
---|---|---|---|
Absorption | Desorption | ||
As-cast | 75.32 | 62.50 | 0.62 |
Cast then annealed at 1223 K | 37.77 | 35.88 | 0.43 |
As-spun | 36.39 | 33.04 | 0.50 |
Spun then annealed at 1223 K | 41.85 | 39.49 | 0.19 |
Fig. 6. Correlation between the equilibrium pressure (Pa and Pd) at 433 K and unit cell volume of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques.
Fig. 9. Hydrogen absorption kinetic curves of the LaNi3.8Al1.0Mn0.2 alloys prepared by different techniques together with fitting curves of diffusion and surface penetration control modes, (a) as-cast; (b) cast then annealed at 1223 K; (c) as-spun; (d) spun then annealed.
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