Mechanical Properties of an Al&lt;SUB&gt;88.5&lt;/SUB&gt;Ni&lt;SUB&gt;8&lt;/SUB&gt;Mm&lt;SUB&gt;3.5&lt;/SUB&gt; (Mm: Misch Metal) Alloy Produced by Extrusion of Atomized Amorphous plus fcc-Al Phase Powders

Ohtera, Katsumasa; Inoue, Akihisa; Terabayashi, Takeshi; Nagahama, H.; Masumoto, T.

doi:10.2320/matertrans1989.33.775

Cited by 70 publications

(26 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3,4) Nanocrystalline Al-based alloys produced using rapid solidification and powder metallurgy techniques have been developed with improved mechanical properties in comparison to conventional crystalline alloys. 5,6) One important route in the development of new high strength Al alloys has been focused on the concept of nanocomposite alloys. 4,7) One type of nanocomposite that has been studied intensively is amorphous nanocomposites composed of α-Al nanocrystals finely dispersed in an amorphous matrix.…”

Section: Introductionmentioning

confidence: 99%

Structural Characterisation and Mechanical Properties of Nanocomposite Al-based Alloys

et al. 2002

View full text Add to dashboard Cite

Nanocomposite Al-based alloys can be obtained with a combination of amorphous, crystalline and quasicrystalline phases. In order to understand the correlation between the nanostructure and the mechanical behaviour, four nanocomposite alloys with different characteristics were studied: two alloys from the Al-Fe-Cr-Ti system consisting of a spherical nanoquasicrystalline phase in an α-Al matrix; one alloy from the Al-Fe-V-Ti system consisting of a mixture of amorphous and α-Al phases; and one alloy from the Al-Mn-Cr-Cu system consisting of nanocrystalline particles embedded in an α-Al matrix. Melt-spun samples were prepared and the structure was characterised by means of X-ray diffraction and transmission electron microscopy. Differential scanning calorimetry was used to study the thermal stability and the transformation processes. Tensile tests, fractographic analysis and Vickers microhardness at room temperature were performed in order to evaluate the mechanical behaviour. A combination of solid solution, particle dispersion and grain refinement strengthening was responsible for the high strength of the alloys. The microstructure of the alloy Al 93 Fe 3 Cr 2 Ti 2 (at%) remained acceptably stable up to 703 K, due to the slow coarsening rate of the icosahedral phase.

show abstract

Section: Introductionmentioning

confidence: 99%

Structural Characterisation and Mechanical Properties of Nanocomposite Al-based Alloys

et al. 2002

View full text Add to dashboard Cite

show abstract

“…The bulk nanocrystalline alloys also exhibit a rather high rotation beam fatigue strength of 330 MPa after 10 7 cycles. It is thus concluded that the nanocrystalline alloy has a higher fatigue strength and higher tensile strength than those for conventional Al-based alloys and newly developed Al-based alloys produced by powder metallurgy processes 1,29 . The nanocrystalline alloys also have lower thermal expansion coefficient and lower wear losses than those for A6061, A5056 and A-17mass % Si alloys.…”

Section: Al-based Nanocrystalline Alloysmentioning

confidence: 99%

“…These H v and E values are independent of the position in the sheet 28 . By warm extrusion of atomized powders consisting of amorphous plus fcc-Al phases, we can obtain fully dense bulk nanocrystalline alloys consisting of fcc-Al phase with grain size of about 200 nm including homogeneously dispersed particles with sizes of 50 to 200 nm [29] . The extruded bulk nanocrystalline alloys exhibit a high yield strength of about 850 MPa, high tensile strength of about 1000 MPa as well as a rather high elevated temperature strength of 250 MPa at 573 K which are much superior to those for A7075 alloy, as shown in Figure 8.…”

Section: Al-based Nanocrystalline Alloysmentioning

confidence: 99%

Development and Applications of Highly Functional Al-based Materials by Use of Metastable Phases

et al. 2015

View full text Add to dashboard Cite

In recent years, there has been a strong demand of developing advanced structural materials with functional properties such as high specific strength, high elevated temperature specific strength, high fatigue specific strength, low corrosion loss and low wear loss. This is because the practical uses of these functional structure materials are expected to cause the saving of material amount, reductions of material cost and energy during material production as well as the saving of consuming energy during practical uses. Besides, the light-weight materials with high corrosion resistance and high wear resistance are effective for the increase of endurance limit and the lightening of final products. Thus, the development of novel Al-based alloys having simultaneously the above-described functional properties is particularly important nowadays.As strengthening mechanisms for Al-based alloys, the following seven mechanisms are generally known 1 : solid solution, grain size refinement, work hardening, age hardening, precipitation, dispersion and defect-induced solute segregation. We have also noticed that the use of rapid quenching enables highly supercooled liquid solidification in conjunction with a high nucleation rate and low growth rate. By utilizing the high nucleation rate and low growth rate phenomenon, we have synthesized various kinds of metastable phases which change from nanocrystalline base structure to bulk glassy base structure through an amorphous base structure with increasing quenching effect (cooling rate). It is also known that the quenching effect is dominated by cooling rate from melt resulting from rapid solidification processes as well as by supercooling capacity of alloy liquid depending on alloy component and composition.When we focus on the strengthening caused by metastable phases, the effect is due to the combination of solid solution + ultra-high density of defects for amorphous phase and dispersion + grain size refinement + segregation for nanocrystalline phase. The amorphous plus nanocrystalline mixed phase alloys are expected to have simultaneously almost all the strengthening mechanisms. By utilizing the combined strengthening mechanisms of these metastable phases, we have tried to prepare novel Al-based alloys with the high tensile strength exceeding 1500 MPa at room temperature, high elevated temperature strength above 500 MPa at 573 K, high rotating beam fatigue strength above 400 MPa at 10 7 cycles, high elevated temperature fatigue strength above 100 MPa at 673 K after 10 6 cycles and high corrosion resistance below 20 mm/year in 0.25 M NaOH aqueous solution at 293 K. In addition, these Al-based alloys have been requested to exhibit a low wear loss, low coefficient of thermal expansion and low material density etc. This paper presents the review of the development achievements of metastable Al-based alloys obtained in our group on the basis of the above-described backgrounds and objectives. This paper reviews the features of alloy components, structure and mechanical properties, p...

show abstract

“…33) Even for Al-and Mg-based alloys with low solute concentrations of 3 -15 at%, various nonequilibrium phases such as amorphous, 34) amorphous plus fccAl, 35) icosahedral plus fcc-Al, 36) and nanogranular hcp-Mg solid solution 37) librium phase powders, we fabricated various nanocomposite bulk alloys exhibiting good mechanical properties. The nanocomposite alloys consisting of Al + Al 3 TM + Al 11 Ln 2 33), 38) and Al + quasicrystal (Q) 33),39) produced by warm extrusion of amorphous (or amorphous + fcc-Al) and Al + Q phases, respectively, exhibit high tensile strength of 500 to 1000 MPa and elongation of 1 -25%, both superior to JIS Al alloys. These Al-based alloys have been widely used in applications such as robot parts, machine parts, die cast molds for plastics, sporting goods, lightweight tools, fishing reels, gears and pedals in bicycles, and wheelchair parts.…”

Section: Supercooled Liquid Metallurgy and Its Significance To Materimentioning

confidence: 99%

Bulk glassy and nonequilibrium crystalline alloys by stabilization of supercooled liquid: fabrication, functional properties and applications (Part 2)

Inoue

2005

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

View full text Add to dashboard Cite

Magnetic properties. Although glassy alloys inFe-and Co-based systems exhibit good soft magnetic properties, the characteristics are expected to be nearly the same as those for amorphous alloys, which require high cooling rates (> 10 5 K/s) for their formation.Recently, it has been found that the soft magnetic properties of Fe-and Co-based glassy alloys are much superior to those for Fe-and Co-based amorphous alloys.1)-3) Figure 1 summarizes the relationship between coercivity (H c ) and the ratio of saturation magnetostriction (λ s ) to saturation magnetic flux density (J s ) for Fe-based glassy alloys, together with data for Fe-based amorphous alloys. A rather good linear relationship is recognized for both alloy groups, which can be expressed as H c ∝ λ s /J s . It is known that the gradient in the relationship between H c and λ s /J s depends on the volume and density of internal defects, i.e., structural inhomogeneity in their alloys. 4) As seen in Fig. 1, the gradient of Fe-based glassy alloys is much smaller than that of Fe-based amorphous type alloys, indicating that the Fe-based glassy alloys have more homogeneous atomic configurations with lower volumes and densities of internal defects than ordinary Fe-based amorphous type alloys produced at much higher cooling rates. It is therefore concluded that the formation of these more homogeneous atomic configurations is the origin of the lower coercivity of Fe-based glassy alloys. Reflecting the lower coercivity, the Fe-based glassy alloys exhibit much higher permeability than Febased amorphous alloys, in conjunction with a rather high saturation magnetization of 1.2 -1.5 T. With their good soft magnetic properties, the Fe-based glassy alloys have been used as consolidated magnetic cores of common mode choke coils and noise filters for electrical power supplies through the development of an inexpensive mass-production process consisting of water atomization, followed by mixing with insulating and lubricating materials, drying, crushing, classification, forming and then heat treatment. Abstract: The novel stabilization phenomenon of supercooled liquid in special multi-component metallic alloys that follow the three component rules has enabled us to fabricate a number of bulk glassy and nonequilibrium crystalline alloys exhibiting useful characteristics. Following the previous review (Part 1; Proc. Jpn. Acad. Ser. B 81, 156-171), this paper (Part 2) reviews our recent results on the physical, chemical, mechanical and magnetic properties of the resulting bulk nonequilibrium materials including glassy single phase alloys, nanocrystal-, nanoquasicrystal-and dendritic crystal-dispersed glassy alloys and nanocrystalline alloys. Finally, the application potential of bulk glassy alloys is addressed, taking account of their novel engineering properties and production processes.

show abstract

Mechanical Properties of an Al<SUB>88.5</SUB>Ni<SUB>8</SUB>Mm<SUB>3.5</SUB> (Mm: Misch Metal) Alloy Produced by Extrusion of Atomized Amorphous plus fcc-Al Phase Powders

Cited by 70 publications

References 12 publications

Structural Characterisation and Mechanical Properties of Nanocomposite Al-based Alloys

Structural Characterisation and Mechanical Properties of Nanocomposite Al-based Alloys

Development and Applications of Highly Functional Al-based Materials by Use of Metastable Phases

Bulk glassy and nonequilibrium crystalline alloys by stabilization of supercooled liquid: fabrication, functional properties and applications (Part 2)

Contact Info

Product

Resources

About