SCIENTIFIC ABSTRACT SHUR, YA.S. - SHUR, YA.S.

• Document Type: CREST
• Collection: Scientific Abstracts
• Document Number (FOIA) /ESDN (CREST): CIA-RDP86-00513R001550220015-0
• Release Decision: RIF
• Original Classification: S
• Document Page Count: 100
• Document Creation Date: November 2, 2016
• Document Release Date: August 23, 2000
• Sequence Number: 15
• Publication Date: December 31, 1967
• Content Type: SCIENTIFIC ABSTRACT

AUTHORS: Shur, Ya. S. and Zaykova, V. A. SOV/126-6-3-23/32
TITLE; On the Influence of Elastic Stresses on thLe Mr--~Gnet-ic
Structure of Silicon Iron Crystals (0 vliyanii
uprue;ikh napryazheniy na aai~nitnuyu strukturu
1~ristallov kreanisto6o zheleza)
PERIODICAL: Fizik*. Metallov i ?.,Ietz-~llovedeniye
1c)-81 Vol 61) Nr 3,
,
pp 5'L5-555 (USSR)
ABSTRACT: The aim of the work described in this -paper was to
establish general relations governinFj the changes in
t-he ma6aetic structure of silicon iron crystals under
the effect of elastic stresses. By rteams of the inethod
of -oowder -oatterns the changes were investigated in the
fqaL,netic S~ructure of such crystals caused by elastic
StreLcIiLin~; of the crystal as a function of the maj~,nitude
of the -tensile force
the type of the initial ma~~,netlc
,
struc-ture and the orientation of dle stresses relative
to tl-ie directions in the crystal. The
i,niv,~ sti --t ions were carried out on coarse crystal
s-Do,z'i!Ae1:-3 -,if iron containir-6 3.50/6 Si,vhereby the
1-
u-ir--e-a-sion-s of th~e i-,ndividual crystals varied bet,.,1een
IC ard 1/4. 0.5 5.0 The speci;.aeas conEisted of 30 ml lon;-
c~ I

SOV/126-6-3-23/32
On the Influence of Elastic Stresses on +--'I,.- Mia,,,,netic Structure of
Sllico--i Iron Crystals
4 mm ~aid-l o.1 to o.2 mm thick strips with various
crystallo6raphic orientc-itions of the surface. The
surface treatment (rn-ec'nanical and electrolytic polishing)
and the preT)aration of the maE;netic suspensions was the
same as in earlier described -worl: of Shur and Abei!s
(Ref 4). The powder patterns were observed by means of
a microscope. The stretching of the specimens was
effected by means of a specially desi6ned instrument, a
photo of which is reproduced in FiS,l. In this the
specimen is fixed between the clamps of a spring dynamo-
raeter which is attached to the stand of a microscope;
the stretching of the speciiaen was effected by means of an
electric motor-driven screw which compressed the spring
of the dynamometer. It was thus possible to obtain a
continuous loadin6 and unloading of the investigated
specilaens and to determine the load from the deflection
of the dynamometer pointer. The applied loads did not
cause plastic deforaation of the specimens. The
observation and photo-~:,raphlng of the powder patterns were
Card 2/4 effected at iaaEnifications of 180 to 300 times. Some of

SO-V/126-6-3-23/32
On the Influence of j~elastic Stresces on the f-Ja6netuic Structure of
Silicon Iron Crystals
the thus produced photographs are reproduced in Figs.2-9.
It vias found chat elastic stretching may bring about
considerable chan6es in the ma6netic structure of crystals
of silicon iron; these changes depend on the magnitude of
the stresses 9 the type of the initial maE-:netic structure
and the orientation of the stresses relative to the
crysuallo6raphic directions in the crystal. Changes in
the structure may consist of displacement of the
boundaries, changirig the dimensions and cessation of-
additional areas and also of chanE;es in the type of
ma6netic structure. The changes in the magnetic structure
caused by tension in the elastic range may be irreversible.
The obtained results can be explained qualitatively if it
is assumed -Lhat,as a result of -the elastic stresses,a
redistribution takes place in the crystals of the sections
where the boundary ener6y has a minimum value wid in the
direction of easy me~gnetisationl which is near to the
direction of the tensile Rrce, magnetis