On the diversity of the plastic response of magnesium in plane strain compression

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• 作者：Konstantin D. Molodov ; ^{kmolodov@imm.rwth-aachen.de" class="auth_mail" title="E-mail the corresponding author} ; Talal Al-Samman ; Dmitri A. Molodov
• 关键词：Magnesium ; Single crystal ; Grain boundary strengthening ; Deformation twinning ; Plasticity ; Anisotropy
• 刊名：Materials Science & Engineering A
• 出版年：2016
• 出版时间：10 January 2016
• 年：2016
• 卷：651
• 期：Complete
• 页码：63-68
• 全文大小：6139 K

文摘

Mg single crystals of selected ‘hard’ and ‘soft’ orientations were deformed at ambient temperature in channel-die compression. Specimens with a ‘hard’ basal starting orientation displayed a limited ductility and fractured along thmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315305700&_mathId=si0004.gif&_user=111111111&_pii=S0921509315305700&_rdoc=1&_issn=09215093&md5=7fb976fe607c9b9f0bc4221a9d687d9d">t="12" width="30" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0921509315305700-si0004.gif">t>t="12" border="0" style="vertical-align:bottom" width="30" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0921509315305700-si0004.gif">t>thContainer hidden">thCode">th altimg="si0004.gif" overflow="scroll">tretchy="true">{11t="true">2̅4tretchy="true">}th> planes. Compression perpendicular to the c  -axis of orientations well aligned for {thmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315305700&_mathId=si0005.gif&_user=111111111&_pii=S0921509315305700&_rdoc=1&_issn=09215093&md5=e3e10af835686b6662c9a0878e03fc8f">t="11" width="23" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0921509315305700-si0005.gif">t>t="11" border="0" style="vertical-align:bottom" width="23" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0921509315305700-si0005.gif">t>thContainer hidden">thCode">th altimg="si0005.gif" overflow="scroll">10t="true">1̅2th>} extension twinning revealed a very contrasting deformation behavior. Specimens compressed along the crystallographic thmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315305700&_mathId=si0006.gif&_user=111111111&_pii=S0921509315305700&_rdoc=1&_issn=09215093&md5=10129d73a66fc825163b98cb2f048ea2">t="16" width="30" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0921509315305700-si0006.gif">t>t="16" border="0" style="vertical-align:bottom" width="30" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0921509315305700-si0006.gif">t>thContainer hidden">thCode">th altimg="si0006.gif" overflow="scroll">tretchy="true">〈11t="true">2̅0tretchy="true">〉th> direction exhibited an exceptionally high room temperature ductility, whereas compression along thmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315305700&_mathId=si0007.gif&_user=111111111&_pii=S0921509315305700&_rdoc=1&_issn=09215093&md5=68f0dd7063284197af74eddbe4e46338">t="17" width="31" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0921509315305700-si0007.gif">t>t="17" border="0" style="vertical-align:bottom" width="31" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0921509315305700-si0007.gif">t>thContainer hidden">thCode">th altimg="si0007.gif" overflow="scroll">tretchy="true">〈10t="true">1̅0tretchy="true">〉th> resulted in failure after an initial sigmoidal stress–strain response. In both cases {thmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315305700&_mathId=si0008.gif&_user=111111111&_pii=S0921509315305700&_rdoc=1&_issn=09215093&md5=5f6f1b11cb377628be362fa73ed078ec">t="11" width="23" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0921509315305700-si0008.gif">t>t="11" border="0" style="vertical-align:bottom" width="23" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0921509315305700-si0008.gif">t>thContainer hidden">thCode">th altimg="si0008.gif" overflow="scroll">10t="true">1̅2th>} extension twins were found to fully consume the matrix at low strains and convert the starting orientations into orientations corresponding to the respective high Schmid factor twin variants. High strains have also been attained for a prismatic starting orientation where the c  -axis was constrained. In specimens, favorably oriented for basal slip, anomalous {thmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0921509315305700&_mathId=si0009.gif&_user=111111111&_pii=S0921509315305700&_rdoc=1&_issn=09215093&md5=8caf8ec53d353488f194498150ff22b8">t="11" width="23" alt="View the MathML source" style="margin-top: -5px; vertical-align: middle" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0921509315305700-si0009.gif">t>t="11" border="0" style="vertical-align:bottom" width="23" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0921509315305700-si0009.gif">t>thContainer hidden">thCode">th altimg="si0009.gif" overflow="scroll">10t="true">1̅2th>} extension twins formed, clustered in bands parallel to the constraint direction. These twins produced a strain opposite to the imposed plane strain deformation and provided a pronounced dynamic grain boundary strengthening effect.