High Mechanical Strength of Quasicrystalline Phase Surrounded by fcc-Al Phase in Rapidly Solidified Al&amp;ndash;Mn&amp;ndash;Ce Alloys

Inoue, Akihisa; Watanabe, M.; Kimura, Hisamichi; Takahashi, Fumiaki; Nagata, Akihiko; Masumoto, T.

doi:10.2320/matertrans1989.33.723

Cited by 126 publications

(59 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…16) It is also observed that the vein pattern is elongated to the shear sliding direction. It is noted that the features of deformation and fracture modes agree with those of amorphous, 17) glassy, 18) nanocrystalline 19) and nanoquasicrystalline 20) alloys. Figure 4 shows the ultimate tensile strength ( UTS ), 0.2% proof strength ( 0:2 ), Young's modulus (E) and elongation () as a function of Zr content for the cold drawn Cu 100Àx Zr x (x ¼ 3, 4 and 5 at%) alloy wires.…”

supporting

confidence: 61%

Ultrahigh Strength and High Electrical Conductivity Characteristics of Cu-Zr Alloy Wires with Nanoscale Duplex Fibrous Structure

et al. 2006

View full text Add to dashboard Cite

The cold drawing of cast Cu 100Àx Zr x (x ¼ 3, 4 and 5 at%) alloys to the reduction ratio of 99.7% was found to cause simultaneous achievement of ultrahigh tensile strength of 1350 to 1800 MPa and high electrical conductivity of 30 to 45%IACS (International Annealed Copper Standard). The cold-drawn Cu 95 Zr 5 alloy wire has a well-developed fibrous structure of fcc-Cu and tetragonal Cu 9 Zr 2 phases. The volume ratio of the fcc-Cu phase was evaluated to be about 76%. A very high density of internal defects was observed inside the Cu 9 Zr 2 phase in the cold-drawn Cu 95 Zr 5 alloy. The microstructure data suggest that the Cu fibrous phase with high aspect ratios is the origin for the achievement of high electrical conductivity and the well-developed fibrous structure contributes to the high tensile strength. The success of synthesizing the Cu-Zr alloy wire with simultaneously high tensile strength and high electrical conductivity exceeding the best combination of all Cu-based alloys reported up to data is expected to be used as a new type of high-strength and high conductivity material because of some advantages of energy saving, low materials cost and simple production process.

show abstract

supporting

confidence: 61%

Ultrahigh Strength and High Electrical Conductivity Characteristics of Cu-Zr Alloy Wires with Nanoscale Duplex Fibrous Structure

et al. 2006

View full text Add to dashboard Cite

show abstract

“…The main drawback, in this case, is the high toxicity of the added element. Other authors [18,37] reported Ce as an effective addition improving the I-phase formation in Al-Mn alloys under different solidification conditions; nonetheless, this was more recently disputed by Coury et al [38]. The addition of Ce was found to stabilise the intermetallic phase Al 20 Mn 2 Ce with a cubic structure reported previously in similar alloys [39].…”

Section: Introductionmentioning

confidence: 83%

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

et al. 2017

View full text Add to dashboard Cite

Al-rich 94Al-6Mn and 94Al-4Mn-2Fe alloys were suction-cast to evaluate the feasibility of obtaining bulk quasicrystal-strengthened Al-alloys at intermediate cooling rates alloyed with non-toxic, easily accessible and affordable additions. The influence of different cooling rates on the potential formation of a quasicrystalline phase was examined by means of scanning and transmission electron microscopy, X-ray diffraction and differential scanning calorimetry. Increased cooling rates in the thinnest castings entailed a change in sample phase composition. The highest cooling rates turned out to be insufficient to form an icosahedral quasicrystalline phase (I-phase) in the binary alloy. Instead, an orthorhombic approximant phase occurred (L-phase). The addition of Fe to the 94Al-6Mn binary alloy enhanced the formation of a quasicrystalline phase. At intermediate cooling rates of 10 2 -10 3 K/s, various metastable phases were formed, including decagonal and icosahedral quasicrystals and their approximants. Rods (1 mm in diameter) composed of I-phase particles embedded in Al matrix exhibited a hardness of 1.5 GPa, much higher than the 1.1 GPa of 94Al-6Mn.

show abstract

“…Be addition is also known for being carcinogenic and causing other serious diseases, such as berylliosis [21], thus, other elements that could enhance the I-phase formation during conventional casting processes are desirable. Additionally, cerium-previously reported as promoting I-phase formation under different solidification conditions [22,23]-was recently disputed by Coury et al [24]. Some other works show that in aluminum alloys alloyed with Mn, Cu, Mg, and Si, primary I-phase particles with petal morphology can be formed at low cooling rates [25].…”

Section: Introductionmentioning

confidence: 99%

Formation of Quasicrystalline Phases and Their Close Approximants in Cast Al-Mn Base Alloys Modified by Transition Metals

Stan-Głowińska

2018

Crystals

View full text Add to dashboard Cite

Abstract:The aim of the presented research was to study the influence of Cr, Co, Ni, and Cu additions on the formation of quasicrystalline particles in the 94Al-6Mn base alloy during casting at intermediate cooling rates. Based on the obtained results, Cu and Ni enhance quasicrystalline phase nucleation compared to the unmodified binary composition. In the case of Cu addition, formation of a quasicrystalline phase takes place along whole thickness of the prepared casting, but its fraction and morphology depends on the cooling rates present in different parts of the sample. Based on the previous works on the beneficial effect of Fe addition, a quaternary alloy containing both Fe and Cu was prepared to evaluate the effect of the simultaneous presence of these elements on the microstructure of the obtained castings.

show abstract

High Mechanical Strength of Quasicrystalline Phase Surrounded by fcc-Al Phase in Rapidly Solidified Al–Mn–Ce Alloys

Cited by 126 publications

References 13 publications

Ultrahigh Strength and High Electrical Conductivity Characteristics of Cu-Zr Alloy Wires with Nanoscale Duplex Fibrous Structure

Ultrahigh Strength and High Electrical Conductivity Characteristics of Cu-Zr Alloy Wires with Nanoscale Duplex Fibrous Structure

Formation of a quasicrystalline phase in Al–Mn base alloys cast at intermediate cooling rates

Formation of Quasicrystalline Phases and Their Close Approximants in Cast Al-Mn Base Alloys Modified by Transition Metals

Contact Info

Product

Resources

About