Issue 14

D.

Firrao et alii, Fr

attura ed Integri

tà Strutturale, 1

4 (2010) 81-92

; DOI: 10.3221/I

GF-ESIS.14.09

com stai

plete agreem nless steel, co

ent with th pper, gold, a

e results of nd aluminium

recent expe alloys disk

riments perfo s [23-25].

rmed by th

e authors by

exposing to

a small ch

arge

A P OF

PLICATION THE TRIPL

OF DEVELO E INDICATO graphic obs anical twins above can be still be obser ted in Fig. 11

PED THEO R CASE

RIES TO TH

E STAINLE

SS STEEL OF

THE SCREW S

twi twi M

etallo mech The

ervations of in isolated gr rationalized ved in a stain , was at the l

the section ains at the su by inferring less steel ob imit of its ow

of a stainle rface (Figs. 1 that the scr ject. By the n sphere.

ss steel scre 3 and 14) and ew was at th same token a

w allowed t no twin bel e limit of the lso the gold

o ascertain ow the surfac sphere in w ring with sc

of ical able

the presence e (Fig. 15). hich mechan antily observ

ns could be ns, as illustra

Figure 13 : T

wins in isolate

d grains at the

surface of a s

tainless steel s

crew of the tri

ple indicator.

Figur

e 14 : Twins in

isolated grain

s at another p

oint of the sur

face of a stain

less steel screw

of the triple i

ndicator.

Figure 15 : N

o twins detec

ted below the

surface of a st

ainless steel sc

rew of the trip

le indicator.

90