Role of rare-earth elements in glass formation of Al–Ca–Ni amorphous alloys

Chen, Z.P.; Gao, J. E.; Wu, Yuan; Li, H.X.; Wang, H.; Lu, Z. P.

doi:10.1016/j.jallcom.2011.10.054

Cited by 17 publications

(8 citation statements)

References 19 publications

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“…Thus, devitrification phenomena during the consolidation of amorphous powders become a necessary study for better selection of multicomponent alloys. The devitrification behavior of glassy alloys synthesized via powder metallurgy is reported to be dependent on the type and atomic size of the elements present in the alloy (Ref [15][16][17][18][19][20], sintering pressure ( Ref 9,21,22), temperature (Ref 10, 12) as well as time (Ref 23). In this context, Huang et al (Ref 15) reported the dependence of crystallization behavior of Al-Ni-La amorphous alloys on Ni and La contents, fabricated via melt spinning.…”

Section: Introductionmentioning

confidence: 99%

The Glassy Structure Formation and Phase Evolution in Mechanically Alloyed and Spark Plasma-Sintered Al-TM-RE Alloys

Maurya

Laha

2019

J. of Materi Eng and Perform

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5 alloy powders via mechanical alloying performed at 300 revolution per minute with ball-to-powder ratio of 15:1 and subsequently the devitrification tendency of 300°C and 500°C spark plasma-sintered bulk amorphous alloys. Mechanically alloyed .5 powders yielded nearly fully amorphous structure after 140, 170 and 200 h, respectively. The requirement of prolonged milling was attributed to the soft and ductile nature of aluminum with high stacking fault energy. Amorphous powders were consolidated via spark plasma sintering at 300 and 500°C by applying a constant pressure of 500 MPa. X-ray diffraction was performed on the 300-and 500°Csintered samples. XRD patterns of the 300°C-sintered alloys exhibited very-low-intensity nanocrystalline FCC-Al peak overlaying an amorphous hump evincing retention of a large amount of the amorphous phase. Enhanced devitrification tendency was reported in the 500°C-sintered alloys; however, a major difference in the devitrification tendency of the 500°C-sintered Al 86 Ni 8 Y 6 , Al 86 Ni 6 Y 6 Co 2 and Al 86 Ni 6 Y 4.5 Co 2 La 1.5 alloys was that the quinary alloy exhibited higher tendency of devitrification, which was also corroborated by performing HRTEM and analytical TEM experiment. This could be attributed to the higher probability of coupling of atoms by short-range atomic shuffling during spark plasma sintering. Vickers hardness, and relative density estimated via ArchimedesÕ principle, varied depending on the degree of free volume annihilation and crystallization during sintering.

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Section: Introductionmentioning

confidence: 99%

The Glassy Structure Formation and Phase Evolution in Mechanically Alloyed and Spark Plasma-Sintered Al-TM-RE Alloys

Maurya

Laha

2019

J. of Materi Eng and Perform

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“…However, cast samples with an amorphous thickness greater than 1 mm have not been achieved to date [12][13][14]; this restriction greatly limits their practical application. Hence, a significant issue is how to enhance the glass-forming ability (GFA) of Albased alloys [3,4,[15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Al-Ni-RE alloys have relatively good GFA among the Al-based metallic glasses developed so far [3,4,[15][16][17][18][19][20][21][22], with the first Albased BMG rod with diameter of 1 mm synthesized from Al 85.5-Ni 9.5 La 5 [4]. Both a large RE atom and large negative enthalpy of mixing between the constituent elements are considered to be favorable for glass formation [27].…”

Section: Introductionmentioning

confidence: 99%

Influence of mutual substitution between La and Gd on the glass-forming ability of Al–Ni–La–Gd alloys

Xiong

et al. 2015

Journal of Alloys and Compounds

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“…In particular, Al-based based metallic glasses have a lower density and higher specific strength compared to other metal-based metallic glasses 10 , which makes them viable for aerospace industrial applications 11 12 13 . Therefore, serious research efforts have been devoted to developing novel light-weight Al-based BMGs 14 15 16 17 18 ever since the first Al-based metallic glass ribbon was discovered in 1988 6 . Up to date, however, material scientists and physicists have not yet to answer the challenge of forming Al-based BMGs that are larger than 1 mm in the smallest dimension.…”

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confidence: 99%

Designing novel bulk metallic glass composites with a high aluminum content

Chen

Gao

et al. 2013

Sci Rep

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The long-standing challenge for forming Al-based BMGs and their matrix composites with a critical size larger than 1 mm have not been answered over the past three decades. In this paper, we reported formation of a series of BMG matrix composites which contain a high Al content up to 55 at.%. These composites can be cast at extraordinarily low cooling rates, compatible with maximum rod diameters of over a centimetre in copper mold casting. Our results indicate that proper additions of transition element Fe which have a positive heat of mixing with the main constituents La and Ce can appreciably improve the formability of the BMG matrix composites by suppressing the precipitation of Al(La,Ce) phase resulted from occurrence of the phase separation. However, the optimum content of Fe addition is strongly dependant on the total amount of the Al content in the Al-(CoCu)-(La,Ce) alloys.

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Role of rare-earth elements in glass formation of Al–Ca–Ni amorphous alloys

Cited by 17 publications

References 19 publications

The Glassy Structure Formation and Phase Evolution in Mechanically Alloyed and Spark Plasma-Sintered Al-TM-RE Alloys

The Glassy Structure Formation and Phase Evolution in Mechanically Alloyed and Spark Plasma-Sintered Al-TM-RE Alloys

Influence of mutual substitution between La and Gd on the glass-forming ability of Al–Ni–La–Gd alloys

Designing novel bulk metallic glass composites with a high aluminum content

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