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By removing excess material at each layer, the fully enclosed voids in the lattice design are faithfully reproduced, confirmed by micro\u2010CT scan, without the need to introduce release holes for precursor materials. Material anisotropy caused by the layer\u2010by\u2010layer fabrication process is removed with a post\u2010print heat treatment. The microlattices exhibited highly similar elastic deformation in the &lt;100&gt; and &lt;110&gt; axes, with stiffnesses at the Hashin\u2010Shtrikman theoretical limit, as predicted previously. However, this isotropy in stress\u2013strain response is unexpectedly extended to the plastic regime as well, even though the microlattices failed via plate buckling in &lt;100&gt; orientation, but by shear banding in &lt;110&gt;. Moreover, the microlattices also displayed remarkable specific energy absorption (15\u201333\u00a0J\u00a0g\n                    <jats:sup>\u22121<\/jats:sup>\n                    ) and energy absorption efficiencies up to 44%, at stresses as high as 410\u00a0MPa. Material work hardening is key to this breakthrough performance, as it raised the plateau stress of the plate buckling failure to approximately the same level as the stretch\u2010dominated elastic limit, which allowed ultrahigh stiffness to be united with excellent energy absorption characteristics in these mechanical metamaterials.\n                  <\/jats:p>","DOI":"10.1002\/smll.73694","type":"journal-article","created":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T14:30:14Z","timestamp":1778164214000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Ultrahigh Stiffness and Energy Absorption Properties of Isotropic Metallic Closed Cell Microlattices"],"prefix":"10.1002","volume":"22","author":[{"given":"Dominic Kang Jueh","family":"Lim","sequence":"first","affiliation":[{"name":"School of Mechanical &amp; Aerospace Engineering Nanyang Technological University  Singapore Singapore"},{"name":"Singapore Centre for 3D Printing School of Mechanical &amp; Aerospace Engineering Nanyang Technological University  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0202-4738","authenticated-orcid":false,"given":"Chang Quan","family":"Lai","sequence":"additional","affiliation":[{"name":"School of Mechanical &amp; Aerospace Engineering Nanyang Technological University  Singapore Singapore"},{"name":"Singapore Centre for 3D Printing School of Mechanical &amp; Aerospace Engineering Nanyang Technological University  Singapore Singapore"},{"name":"School of Materials Science &amp; Engineering Nanyang Technological University  Singapore Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,5,7]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/jiec.70040"},{"key":"e_1_2_10_3_1","unstructured":"CSIS Aerospace Security Project (2022) \u2013 with minor processing by Our World in Data. \u201cCost of space launches to low Earth orbit\u201d [dataset]. 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