nano 2006-12-11 01:53
Synthesis and mechanical behavior of nanostructured materials via cryomilling
D.B. Witkina, and E.J. Laverniab,
.Jg)G8Aj
1@"v6tls l~!R
Department of Chemical Engineering and Materials Science, University of California, Irvine, CA 92697-2575, United StatesWb jY4W&n R)v
Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, United States#k&SL9z:YE
j s1N
9Wj U3c5m!Gy Y
[font=Verdana][size=2][/size][/font][url=http://www.sciencedirect.com.login.ezproxy.library.ualberta.ca/science?_ob=PublicationURL&_cdi=5577&_pubType=J&_auth=y&_acct=C000051251&_version=1&_urlVersion=0&_userid=1067472&md5=e91856533d55895eb0cfa3f6a51abc9a][size=2][color=#0000ff][font=Verdana][b]Progress in Materials Science[/b] [/font][/color][/size][/url], [font=Verdana][url=http://www.sciencedirect.com.login.ezproxy.library.ualberta.ca/science?_ob=PublicationURL&_tockey=%23TOC%235577%232006%23999489998%23607291%23FLA%23&_cdi=5577&_pubType=J&view=c&_auth=y&_acct=C000051251&_version=1&_urlVersion=0&_userid=1067472&md5=27ef5a31674a62255f5c7dac1c08ba33][size=2][color=#0000ff]Volume 51, Issue 1[/color][/size][/url][size=2] , January 2006, Pages 1-60; [url=http://dx.doi.org.login.ezproxy.library.ualberta.ca/10.1016/j.pmatsci.2005.04.004][size=1][color=#0000ff]doi:10.1016/j.pmatsci.2005.04.004[/color][/size][/url][/size][/font]
:D kff!r l _
'c%WCN fI8H w
5k,~i }/u|u
q&cY1^
aX
[b]Abstract[/b]
B,St w.h `
0m!\ S p$j6_6c
Cryomilling, the mechanical attrition of powders within a cryogenic medium, is a method of strengthening materials through grain size refinement and the dispersion of fine, nanometer-scale particles. The technique was developed as a means to decrease both the size of these particles and their spacing within a metallic matrix to increase threshold creep stress and intermediate temperature performance. More recent work has been concerned with increasing the strength of lightweight structural materials. In this overview paper, the available literature is reviewed that covers the microstructural evolution during cryomilling, consolidation and processing, the thermal stability of the microstructure, and mechanical properties of consolidated materials. The properties of cryomilled materials are compared to those results for powders and consolidated materials generated by mechanical alloying, milling at ambient temperatures and other means to produce fine grained materials.
.p [ `/T0e-y
mC{y2g!b ~
fU
[b]Article Outline[/b]E.c0A1o]
c/j,H[/UQ,A g:RX L
1. Introduction
q @'i F j;i p
B(o"W
l/o
1.1. Motivation
)l_!Mz2F ol0[Y2w
h4E0c
1.2. Apparatus and processingo%dkWD#ap9{$vw
1.3. Description of consolidated cryomilled Al
bny@ q]
}"h_+I(Q3R7p2F&l1i
2. Structural evolution of cryomilled materials
;Pw8~6?Y \ qgQHK
%gT#l;v1m I p2S T/C
2.1. Formation of nanocrystalline structure'm KtK!^'u,}-h+n1R&U6LS
2.2. Thermal stability of cryomilled powders
@5xZl7Lr ER
2.3. Grain size characteristics and distributions
a]
~
af3mq T
2.4. Primary consolidation of cryomilled powderzF-e:QsOT X0k'T0qn
2.5. Processing of primary consolidated forms%zz!ou B O"?
s%M^7Bf
3. Mechanical properties of cryomilled materials
Q5g
\,z4f!CY
Q%{J0[*U'f
3.1. Overview of mechanical properties
(_8m Q P']"A"N${{'U
3.2. Room temperature deformation: strengthening mechanisms of cryomilled Al#\3D;s V Ym_ Ha
3.3. Room temperature mechanical properties: nature of deformation fe:a(S U/Z0O
}_&Q%z!y$xo!ro
3.3.1. Inhomogeneous flow tw%ZS iaLZ_%J
LH,TH'_;{
3.4. Room temperature mechanical properties: compression testing of Al 5083.[&Hp'y0nn
Wm(ON eV\
4. Conclusions f \d$jD J t
\
AcknowledgementsDTuav6l
References
CG^;o)v#h0U%W H
[url=http://imageshack.us/][img]http://img135.imageshack.us/img135/2860/06tg6.jpg[/img][/url][URL=http://imageshack.us][IMG]http://img95.imageshack.us/img95/9388/08pc4.jpg[/IMG][/URL]Ss/t-c ~T
w
A}1fR
S!WO
lse*fu d
[url=http://www.sciencedirect.com.login.ezproxy.library.ualberta.ca/science?_ob=ArticleURL&_udi=B6TX1-4GJVB0D-1&_user=1067472&_handle=C-WA-A-W-W-MsSAYVA-UUW-U-U-W-U-U-AAZYBCBBZD-AAZCEBVAZD-ABECDBYED-W-U&_fmt=full&_coverDate=01%2F31%2F2006&_rdoc=1&_orig=browse&_srch=%23toc%235577%232006%23999489998%23607291!&_cdi=5577&view=c&_acct=C000051251&_version=1&_urlVersion=0&_userid=1067472&md5=8b4b80f719da60686d893909630ca3ef]:sc[/url]6@%u#@s L/l @ V:s
n{ D#H }K C
[url=http://www.box.net/public/56d6dvfnut]:downloads :box :pdf[/url]