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Inside the test piece, a hole about 0.7 inches wide had stripped the metal of most of its load-bearing strength.<\/p>\n
Working from that failure, Yong He at Zhejiang University (ZJU<\/a>) and colleagues pressed a reactive paste into the cavity.<\/p>\n At ZJU, he and his team showed pressure locked the repair into the surrounding copper instead of leaving a weak filler.<\/p>\n That outcome made the material feel less like a lab trick and more like a repair route worth taking seriously.<\/p>\n A chemical cure<\/p>\n Rather than melting everything together, the recipe started with copper powder and a gallium-indium liquid that stayed fluid in the air.<\/p>\n Sodium hydroxide acted as a catalyst, a substance that speeds a reaction, helping gallium wet the copper and move across its surface.<\/p>\n Once atoms began crossing that boundary, new copper-gallium compounds formed in place and the slurry hardened without outside heating.<\/p>\n That is why the team called it a \u201cconcrete-type alloy,\u201d a name that fit because mixing triggered the cure instead of a furnace.<\/p>\n Pressure closes pores<\/p>\n One problem appeared quickly, because the reaction also produced hydrogen that could get trapped as tiny pores.<\/p>\n To fix that, the team used cold isostatic pressing<\/a>, a method that squeezes equally from all sides, after the alloy had set.<\/p>\n After pressing, porosity fell to 4.83%, and the material became about 10% denser than the printed version.<\/p>\n Less empty space meant fewer weak spots, setting up the jump in stiffness and hardness that came next.<\/p>\n Strength climbs fast<\/p>\n Before pressing, the material already behaved like a structural metal, with nanohardness near 1.2 GPa and stiffness near 120 GPa.<\/p>\n After pressing, nanohardness, resistance to a tiny point pushing inward, rose to five GPa, while stiffness reached 150 GPa.<\/p>\n Pressure<\/a> also raised stiffness sharply, showing the same material became tougher after defects were squeezed down.<\/p>\n Those values help explain why the repaired regions outperformed ordinary copper at the surface instead of merely filling space.<\/p>\n Holding off corrosion<\/p>\n Strength alone would not be enough, because repair metals also fail when water, salt, or reactive chemicals attack them.<\/p>\n Corrosion tests showed the new alloy<\/a> formed a more stable passive film, a thin protective surface layer, than copper alloys.<\/p>\n Its resistance stayed strongest in acidic and alkaline solutions, although salty conditions still accelerated corrosion for both materials.<\/p>\n That balance matters for real repairs, since factory equipment sees messy environments long before it reaches a test machine.<\/p>\n The team then mixed in carbon fibers and MXene, a layered carbide sheet, to push the repair<\/a> further.<\/p>\n Carbon fibers helped stop cracks from spreading, while MXene reacted more actively at the interface and bonded more tightly.<\/p>\n That difference showed up in testing, where MXene-reinforced surfaces reached 10 GPa and showed more even pore distribution.<\/p>\n A cleaner internal layout meant the added phase improved the whole repaired zone, not just the outer skin.<\/p>\n Broken parts recover<\/p>\n In full workpieces, the repaired cylinders deformed much like undamaged ones instead of collapsing in an uneven squeeze.<\/p>\n Small-scale tests showed the repaired region reached about two GPa at the surface, compared with 0.5 GPa in the standard region.<\/p>\n Microscopy still found pores, but they were shallow enough that the overall compression behavior stayed close to normal.<\/p>\n That mix of strength and forgiveness matters, because industrial repairs rarely happen on perfectly clean, flawless metal.<\/p>\n Why heat dominated<\/p>\n Traditional alloy making usually depends on furnaces or laser systems that spend huge energy just breaking old metal bonds.<\/p>\n An earlier paper<\/a> from the same ZJU group had already shown room-temperature alloy printing, but strength remained the central challenge.<\/p>\n This newer study answered that problem by combining chemical curing with pressure and reinforcement instead of relying on heat alone.<\/p>\n That mix could matter most where fuel is limited, repair windows are short, or hot processing would damage nearby parts.<\/p>\n Limits still matter<\/p>\n Even so, the process is not finished, because trapped gas and leftover sodium chemistry can still complicate performance.<\/p>\n Researchers said better venting during pressing should cut those defects further, especially before the material fully hardens.<\/p>\n Future tests also need vacuum, low-temperature, and high-pressure conditions if the alloy is going to leave the lab.<\/p>\n Those gaps do not erase the result, but they set the line between a clever material and a dependable one.<\/p>\n Where this leads<\/p>\n Room-temperature metal repair looked unrealistic until chemistry, pressure, and reinforcement worked together here as one manufacturing system.<\/p>\n If scaling and durability hold up, factories, field crews, and even off-world builders could patch structural metals with far less heat.<\/p>\n The study is published in the International Journal of Extreme Manufactur<\/a><\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Researchers have demonstrated that a metal mixture can react and harden at room temperature into a solid as…\n","protected":false},"author":2,"featured_media":397896,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[163,85,46],"class_list":{"0":"post-397895","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-health","8":"tag-health","9":"tag-il","10":"tag-israel"},"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/posts\/397895","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/comments?post=397895"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/posts\/397895\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/media\/397896"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/media?parent=397895"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/categories?post=397895"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/il\/wp-json\/wp\/v2\/tags?post=397895"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}