Studies of technologically important materials using synchrotron radiation

with Fe, lJsing Zr02 tools a layer was formed on the balls and prevented contamination but did not amorphize the powder. W and Mo did not compounds.

synthesize

any

intermetallic The

DENSIFICATION OF MOLYBDENUM DISILICIDE BY HIGH TEMPERATURE SYNTHESIS

UNDER

Physics

Ik University,

Seoul,

Korea). J. Korean

Inst. Met&s, Vol 33, No 8,

1995, 1091-1100.

(In Korean.)

It is reported

that

been synthesized 35 MPa,

synthesis

MoSi,

had high

under a pressure

selection

pressure

and additions

densities

up to 99%.

of

of

applied

of Al and Ti gave

Mechanical alloying CORROSION

OF AMORPHOUS

NICKEL-

ZIRCONIUM POWDERS FORMED MECHANICAL ALLOYNG T. Tukuhiro Japan) J.

BY

alloys, prepared pitting

from MA powder,

was investigated potential.

with

that

pitting

to

resistance

reported Ni and

measurements are useful MA mechanisms.

in NaCl regard

The corrosion

of the alloys was intermediate between suggested

to Zr.

be It is

potential in the study

of

DEFORMATION DURING

VACUUM

COMPACT

AND SINTERING

K. Miurd et al. (Japan Steel Works Ltd., Yotsukaido, .lapan). J. Japu71 Sot. Powder Powder Metall., Vol 42, No 1, 1995, 97-102. (In dapanese.) Factors affecting deformation of complex shaped inject.ion moulded parts during debinding and sintering were investigated. During debinding deformation was due to release of internal stresses and viscous creep the amount of deformation depending on moulding pressure and rate of binder removal. Sintering deformation is shown to depend on thermal stresses caused by temperature differences and part geometry.

Nuclear materials METALLURGY

OF URANIUM

Beijing,

China)

Vol 13, No 4, 1995, 303-306. The

paper

characteristics

of Science

and

PM Technol., In Chinese.

describes of

was

METALLURGY (University

of

uranium

the

Birmingham,

PM

carbide.

processes. Use of neutron diffraction to determine stresses in parts was described. Neutrons penetrate the lattice and detect distortions caused by stress. These cause small shifts in positions of Bragg reflections. Examples of some engineering parts were given

EURO

PM’95.

follow

are

The

of

was held in Birmingham, October 1995.

E. Gordo et Metallurgical

MATERIALS

A dilatometric: thermal behaviour

BY

G. Bushell-Wye (Daresbury Daresbury, Warrington, UK)

Laboratory,

It was reported that synchrotron radiation can be used in characterization of materials. The information given and by X-ray diffraction and spectroscopy was discussed. Recent and future trends were outlined and the need for improved instrumentation was emphasized.

respect

anisotropy

to

and

scaling

was discussed

factor,

composition

due to various

data fog defects,

variations

and

causes. Note was

made of the meso scale which is intermediate between the macro and microscopic STUDIES

IMPORTANT

MATERIALS

USING

RADIATION

P. Weightman (University of Liverpool, Liverpool, UK). Application of siynchrotron radiation to the study of metals, alloys and semiconducting materials was outlined and discussed. The tunable nature of the radiation was shown to be of advantage in determination of structures. DETERMINATION

OF RESIDUAL

BY NEUTRON

in

STUDY OF M2/3 HIGH AND

CARBIDES al. (National Invest,igations,

Ccntre for Madrid,

Spain), investigation of the of MS;;3 HSS with

of

NbC. TaC and Cu:#, as a aid, was described. The were to optimise sintering and

ob,jectives

heat treatment, conditions. MODIFIED

HIGH SPEED

PRODUCED

FROM

SOLIDIFIED

POWDERS

M. Miskovicova Sciences,

STEELS

RAPIDLY

et al. (Slovak

Academy

of

Kosice, Slovakia).

Investigations of stru&urrs and cutting propert,ies of sintered M2 HSS were Atomized

additional extrusion

powders

with

Nb, Co and Ti and hot powder were used. The additional were

crystallisation.

shown

to

As-consolidated

affect the

alloys

were reported to have improved cutting properties in comparison with cast: wrought

materials

favourably tools.

with

and

compared

polycryst,allinca

diamond

scales.

OF TECHNOLOGICALLY

SYNCHROTRON

TANTALUM

elements property

and other materials

structure

Bir-

UK,

STEEL WITH NIOBIUM

described.

of Birmingham,

Scatter in mechanical with

DILATOMETRIC

additions sintering

SPECTROSCOPY

were

alloy steels

High

outlined. Entrapment of gasses in sprayed deposits and developments in HIP were referred to.

AND

which

which

presented at the European Conference on Advanced Materials which

SPEED

CHARACTERIZATION

abstracts

papers

assessment of metal cleanliness. Recent trends in vacuum induction melting were discussed. Application to Ti alloys, Ti aluminides and other materials was

STRESS et al. (University

Technology,

of

Birmingham, LJK). Vacuum metal melting techniques were reviewed. Electron beam and plasma arc methods were considered in the light of the need for clean metals and alloys and

metallic

Z. Yong

are

which

Congress

J.F. Knott (IJniversity mingham, 1JK)

OF INJECTION

THIN WALLED

DEBINDING

POWDER CARBIDE

follow

ORIGINS OF SCATTER IN MECHANICAL PROPERTY DATA

Metal injection moulding MOULDED

which

rt ul. (Kansai IJniversity, Suita, Japan Sot. Powder Pounder X-RAY DIFFRACTION

Mt+tall., Vol 42, No 1, 1995, 113-117. (In Japanese.) Corrosion resistance of amorphous Ni-Zr solution,

Anm~wl

M. Jacobs

porous

by self propogating

Proper

abstracts

PRESSURE

M.D. Ka et al. (Hong

temperature

Strengthening by a secondary hard phase and use of sintering aids are discussed.

DIFFRACTION

P.J. Webster (University of Salford, Salford, UK). Residual stresses in metal parts were outlined in terms of origins in production

Light alloys and composites INTERFACE

FRACTAL

DIMENSION

IN

COMPOSITES RELATED TO INFLUENCE OF SINTERING ON STRENGTH L. Mishnaevsky

(Technical

llnivrrsity

01

Vienna, Vienna, Austria) A

mathematical

formation composites structure

model

of

int,rrfacr

in liquid phascl sintered and the effect of interface on strength

was proposed.

Mass

transfer between solid and liquid phases and deposition on grains was considered to lead

to

fractal

surfaces

dimensions relationship

were between

and sintering

conditions

fraetal

surface

was

for

which

determined. A fractal dimensions was analysrd.

considered

MPR October

to

1996

The bc

41

a