Structures of A15 intermetallic compounds formed by mechanical alloying

Structures of A15 intermetallic compounds formed by mechanical alloying

Conference Io Powder 2000 It was noted that PM parts may be damaged Metallurgy World Congress, held in Kyoto, Japan, in November during For fur- ...

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Conference Io Powder

2000

It was noted that PM parts may be damaged

Metallurgy World Congress, held in Kyoto, Japan, in November

during

For fur-

2000.

Bldg, 2-16, Iwamoto-cho

2-chome,

ing. Variations emphasis

(N&d

was reported

Tsing-Hua

T.Watmabe

that

Mn-Zn

by longitudinal

and Ni-Zn

microwave processes. Sintering

behaviour

was

investigated

material

and

with

regard

variables

to

and

process

control.

between Mn-Zn and Ni-Zn ferrites were outlined.

bronze

of

was presented.

This

theories

approach. tionally

a new

The

fracture

depends

theory

on new

and was developed analysis

and

an

and from

energy

The new theory was applied addito other

associated

fracture

with fracture,

mode II and mixed

criteria.

Problems

including

mode

modes of fracture

considered.

Singular defects affecting fatigue of PM materials B.Weiss,

(University

H.Danninger.

of Technology,

Vienna, Austria.) The

sensitivity

was noted. shown

of PM materials

Defects

that

were

the

to defects

identified.

effects

of

It was singular

defects can be described by a Kitagawa diagram based on fatigue intensity that realistic

factor.

limit

and threshold was

It

predictions

stress

suggested

are only possible

stress fields round defects and interactions adjacent defects are taken into account.

www.metal-powder.net

modulus

were

et

al.

(University

of Technology,

Dresden,

if

with

were characterized ness. Al,Ni,

pow-

alloyed in Ar. Powders

for size, structure and hard-

AlNi,,

and traces of Al,Ni,

and

A13Zr were detected. Milling reduced crystallite size to 10 nm. The structure was stable on heating with further synthesis of Al,Ni,.

Structural evolution in aluminiumiron-chromium powders during high energy milling (Toyama University, Japan.)

were mechanically weight

ratio

at a ball:powder

of 238:lO.The

were characterized to determine cx Al(Fe,Cr)

25. 35 or SO)%Fe

alloyed

milled

powders

for structure and properties

the effects of the Cr addition. and CI Fe(Cr)

solid solutions were

formed initially with intermetallic

compounds

M.Mihad

et

al.

of Cmioua, Craiova,

(University

RomLmia.) importance and

of detecting

variations

inhomogeneities

in

in

injection

It was reported powders,

with

that superconducting A15

structures

alloy

had

been

moulded brown parts and the need for repro-

formed by mechanical

ducibility were emphasized. Defects may not be

and Si powders. The powders were evaluated

detected before production

for effects of process parameters.

of parts has started,

which may lead to disruption Microtomography destructive

of production.

was identified

technique

for detection

alloying of Nb, V, B, Al

peratures for superconductivity

Critical

tem-

were measured.

as a nonof density

was discussed.

Friction and porous materials

Mechanical alloying

Effects of admixed solid lubricants on dry sliding behaviour of sintered steels

variations.

Optimization

of process parameters

I,

were

alloying. Al-8%Ni-l.S%Zr-O.S%Mn-O-C der was mechanically

was

Structures of Al5 intermetallic compounds formed by mechanical alloying

density

(PO Box 1770, Cairo, Egypt.)

on Young’s

regard to use of mechanical

with

phases,

Study of three-dimensional density distribution in injection moulded ‘brown’ parts

Composites and new concepts of fracture Application

materials

of Fe base and

alloys,

discussed

Ternary Al-Sat%Cr-(10,

Effects of materi-

Al

of intermetallic

Z.Yong etal.

of Young’s modulus of sin-

and density

in strengthening

by formation

later and finally the powders were amorphized.

LJ.Btrth

experimental

and

of Ni

World Congress and

discussed.

Gemmy.)

updated

content

University, Japan.)

oscillations.

al composition

Testing and evaluation

R.El-Sheikhy.

with

tered materials were made using dynamic tests

University,

and

and applications

of porosity

et al. (Was&

Measurements

ferrites had been sintered by conventional

Differences

and density were

Young’s modulus of sintered materials

Taiwan.)

process

were

during tensile test-

in elasticity

on effects

is

matrix microstructure.

Co-sintering of manganese-zinc and nickel-zinc ferrites

It

this

measured at different plastic deformations

Sintering

al.

and that

defects. Concepts

of damage mechanics

used to study deformation

Japan;

fax: +81-(o)3-5687-0599.

et

loading

and methodologies

tel: +81-(0)3-3862-6646;

C.Y.Tstiy

mechanical

associated with pre-existing

ther details contact the JPMA: Tamagawa Chiyoda-ku, Tokyo 101-0032,

Effects

Damage evolution in PM alloys under tensile loading

PM 2000. The following Abstracts are of papers presented at the

Featuring selected abstracts from the PM2000

Fabrication of iron-silver laminated nitride materials

H.Danninger

M.Nagae

the

et al (Okayam

Laminated

University,

Okuyama, Japan.)

Fe-Ag nitride material was made

by nitriding

rolled foil, stacking and re-rolling

repeatedly.

Structures

and

electro-magnetic

properties were measured and the results were discussed.

Synthesis of aluminium alloy base nano-composite by mechanical alloying T.Raghu

et al.

Hydembad,

In&.)

(Defence

Metdurgical

Research Lab,

et al. (University

of Technology, Vienna,

AUStliLZ.)

Dry pin-on-disc effects

tests were used to evaluate

of solid

lubricants

incorporated

into sintered

steels. Pb and various sulphides

were

but

added

Reduced

sulphides

into

decompose

FeS

coefficient

were

during

of friction

shown

to

sintering. was rare and

was linked

to high wear rates in dry tests.

Mechanisms

for the wear rates were described.

Tribological properties of ceramic and metallic composite coatings R.G&w,

D.Scherer.

(University

of Stuttgart,

Stuttgmt,

Germany.)

MPR November 2001

41