Nyob rau hauv high -} Cov teb kawg xws li kev tshawb nrhiav, cov ntaub ntawv yuav tsum ua kom tiav, thiab ua kom tiav rau huab cua sov ua haujlwm. Cov duab nco alloys tau ntev tau pom tias yog cov khoom muaj txiaj ntsig zoo heev vim lawv lub zog zoo tshaj plaws, kev ua kom muaj peev xwm ua tau zoo. Nyob rau lub Ob Hlis 2025, cov pab pawg tshawb fawb tau coj los ntawm Ryosuke Kainuma ntawm Tohoku University hauv Nyiv, hauv kev koom tes nrog International Alenteâ {} chromium {}} beed alloy. Cov khoom siv sib txuas ntxiv ultra {{8} Lub zog siab, thiab yog dav hla ntau tiam ntawm titorium alloys. Kev sib piv ntawm superelastic kub thiab lub lightweight cov yam ntxwv tau qhia hauv daim duab 1.
1. Tsim los ntawm kev ua kom zoo nkauj tshiab high- lub zog alloy muaj pes tsawg leeg
Los ntawm kev qhia lub teeb yuag yuag (al) thiab chromium (cr) matrix, ib qho alloy nrog ib feem ntawm Ti-20al-4.75cr (atomic feem pua) tau tsim. Qhov no alloy muaj qhov ntom ntom ntom (4.36 × 10³ tawm ntawm li 185} Lub zog superelastic ntawm ze<110>Ib Leeg -} Crystal Ti - AL-}} Str alloys muaj nyob hauv daim duab 2.
2. Ultra {{1} Yeej muaj ntau qhov ntsuas kub thiab qhov ntsuas kub tshaj tawm
Titanium {-} Al1 1}} chromium {2} Qhov twg yog ntau tshaj li tsib zaug ntawm kev ua lag luam ni {{} ti alloys (feem ntau 273-353 k). Cov yam ntxwv no yog qhov teeb meem ntawm kev ua tsis tiav superelastic hauv cov pa hluav taws xob nco alloys ntawm qis lossis siab kub.
3.
Kev ywj pheej tsis zoo ntawm qhov kev ntxhov siab tseem ceeb rau theem kev hloov pauv tau pom thawj zaug hauv tsis {}} sib nqus oys: ntawm cov kub qis (<200 K), the critical stress increases as the temperature decreases. This phenomenon is revealed through lattice dynamics analysis and is attributed to the significant increase in the shear modulus (C') of the parent phase (B2 structure) at low temperatures, which enhances the lattice's resistance to shear deformation, thereby broadening the temperature range for superelasticity.
4. Lub siab zoo siab thiab qaug zog tsis zoo
Lub alloy ua pov thawj kev coj ua tau zoo ntawm 7.3% ntawm kev ua lag luam ni {{}} n}} raws li alloys (<3%). Moreover, it maintains stable superelasticity even after 200 loading-unloading cycles, demonstrating excellent functional fatigue resistance.
5. Hais rau B2 qauv thiab Nanodomain ntxiv dag zog
Los ntawm kev txiav txim siab nrawm thiab cua sov ntawm cov ntaub ntawv ntawm alloy Qhov kev txiav txim rau Nanostructure zoo zoo inibits unlocation swb, txhim kho rau cov yas deformation, thaum tswj lub siab elastic plast.
