Acta Materialia最新文献

{"title":"Characterization and modeling of continuous dynamic recrystallization (CDRX): Application to 2139 aluminum alloy","authors":"Lahcen Abaray ,&nbsp;Baptiste Flipon ,&nbsp;Malik Durand ,&nbsp;Nicolas Bayona Carrillo ,&nbsp;Marc Bernacki","doi":"10.1016/j.actamat.2026.121922","DOIUrl":"10.1016/j.actamat.2026.121922","url":null,"abstract":"<div><div>Controlling microstructure is a key factor in hot metal forming as it affects the performance of metallic materials. In high stacking-fault-energy materials, including aluminum alloys, continuous dynamic recrystallization (CDRX) drives microstructural evolution. In this study, hot compression tests were conducted on the AA2139 alloy across a wide range of thermomechanical conditions to (i) characterize the CDRX mechanism and (ii) generate experimental data for model calibration. Microstructural investigations were conducted to examine the development of grain and subgrain structures, and the evolution of disorientation distributions. Evidence of CDRX was observed through the formation of low-angle grain boundaries (LAGBs), their progressive increase in disorientation, and their transformation into high-angle grain boundaries (HAGBs), both in grain interiors and near original grain boundaries. Increasing strain promoted the progressive disorientation of LAGBs. Strain rate and temperature strongly influenced subgrain size, LAGB density, and dynamic recovery. Based on these results, a physically based CDRX model was developed by extending the work of Gourdet and Montheillet. The proposed improvements introduce the contribution of LAGB energy and disorientation angle to the subgrain-rotation law, a crystallite-size-dependent rate of LAGB creation through a refined physical description of the parameter <span><math><mi>α</mi></math></span>, and the incorporation of self-heating effects during deformation. Together, these developments significantly enhance the physical consistency of the model. The overall experimental trends were reproduced, including the decrease in crystallite size and the increase in LAGB density at higher strain rates and lower temperatures, as well as the higher mean LAGB disorientation angle observed at lower strain rates. In addition, the model captures the macroscopic flow stress under various thermomechanical conditions.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121922"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145995333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Refining hydrogen-dislocation interaction model for thermally activated plasticity in Fe-Cr-Ni austenitic steels: Analyzing stress-dependent activation volume","authors":"Yuhei Ogawa,&nbsp;Akinobu Shibata","doi":"10.1016/j.actamat.2026.121896","DOIUrl":"10.1016/j.actamat.2026.121896","url":null,"abstract":"<div><div>Understanding the role of diffusible solute hydrogen (H) as an obstacle to dislocation glide is essential for elucidating the solid solution-hardening mechanisms induced by H in Fe-Cr-Ni austenitic steels and other face-centered cubic (FCC) alloys. In the present study, we address this issue through an effective use of classical stress relaxation tests with a relatively long duration (∼1000 s) at 295 K. A Type310S (Fe–24Cr–19Ni) austenitic stainless steel was examined after uniformly pre-charging ∼8500 at ppm H under a pressurized high-temperature gaseous H₂ environment. The activation volume, <em>V</em> (<em>i.e</em>., a material volume involved in an elementary obstacle-dislocation interaction), as a function of externally applied stress, was analyzed to probe the impact of H on thermally activated dislocation motion through a field of multiple obstacle types. A unified stress–<em>V</em> relationship was identified for both non- and H-charged specimens, in addition to an H-induced retardation of deformation kinetics under an equivalent stress level. These findings demonstrate that the primary obstacles to dislocation motion are alloying elements (and forest dislocations) even under the presence of H, with H contributing an additional activation barrier to overcome these inherent obstacle types.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121896"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of shape memory alloys with enhanced thermal management properties via adaptively constrained multi-objective optimization","authors":"Yuan Tian ,&nbsp;Bin Hu ,&nbsp;Pengfei Dang ,&nbsp;Shuya Dong ,&nbsp;Sheng Sun ,&nbsp;Dezhen Xue ,&nbsp;Turab Lookman ,&nbsp;Tongyi Zhang","doi":"10.1016/j.actamat.2025.121874","DOIUrl":"10.1016/j.actamat.2025.121874","url":null,"abstract":"<div><div>Shape memory alloys (SMAs) as solid–solid phase change materials are promising candidates for addressing thermal loads in electronic devices. High thermal energy storage (TES) performance and narrow overall transformation range (OTR) are desirable for rapidly mitigating excess heat in devices with confined spaces and narrow operating temperature windows. However, achieving a combination of high TES performance and a narrow OTR remains challenging due to the inherently conflicting nature of properties and the vast compositional design space. To address this, we propose an adaptively constrained multi-objective optimization strategy that evaluate the expected hypervolume gain of candidates within a constrained preferred region. Through visualization on a mathematical function case and comparative experimental exploration on SMAs, this constrained strategy demonstrates significantly enhanced efficiency in guiding the search toward favorable property trade-offs. With the constrained strategy, all 10 synthesized alloys across three experimental iterations exhibit high TES performance and narrow OTR. Especially, alloy Ti_50.2Ni_43.6Cu_5.8Al_0.4 displays a high TES performance of 2690 <span><math><mo>×</mo></math></span> 10<span><math><msup><mrow></mrow><mrow><mn>6</mn></mrow></msup></math></span> J<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> K⁻¹ s⁻¹ m⁻⁴, which is over 6 times higher than commercial organic PCMs, and 2<span><math><mo>∼</mo></math></span>3 times larger than the best-performing TiNiCu (B2–B19) alloys reported in the literature for electronic thermal management. Its narrow OTR (26.81 °C) lies well within the acceptable operating temperature range of electronics. Moreover, it demonstrates good thermal stability after rolling, with a slight shift of 0.18 K in transformation temperature and a decay of only 0.15 J/g in latent heat after 40 cycles.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121874"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145894147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Formation of four-membered rings in metallic glasses with minor additions","authors":"Sinan Liu ,&nbsp;Ruohan Yu ,&nbsp;He Zhu ,&nbsp;Ao Yan ,&nbsp;Haoran Sun ,&nbsp;Jiacheng Ge ,&nbsp;Gang Sha ,&nbsp;Yubin Ke ,&nbsp;Huihui Kong ,&nbsp;Harald Fuchs ,&nbsp;Wei Liu ,&nbsp;Yang Ren ,&nbsp;Joerg C. Neuefeind ,&nbsp;Zhenduo Wu ,&nbsp;Lin Gu ,&nbsp;Xun-li Wang ,&nbsp;Si Lan ,&nbsp;Yuqiang Ma","doi":"10.1016/j.actamat.2026.121897","DOIUrl":"10.1016/j.actamat.2026.121897","url":null,"abstract":"<div><div>The structural nature of amorphous materials remains a long-standing challenge in condensed matter physics. The emergence of order within disorder has driven significant breakthroughs, including the discovery of quasicrystals and structural motifs in amorphous systems. Among these motifs, ring structures, which exhibit rotational symmetry without translational symmetry, play a crucial role in enabling fractal packing and long-range disorder in network glasses, such as oxide, chalcogenide, and halide systems. However, their universality in simple atomic systems, like metallic glasses, remains unsolved. Here, a four-membered Frank-Kasper (FK) cluster ring structure, denoted as 4M-Ring, has been proposed to be a consistent structural model for a metastable amorphous phase of Cu-Zr-Al-Y bulk metallic glasses. This medium-range structural motif, about 15 Å, is geometrically stable and energetically favorable. The addition of yttrium (Y) as a minor alloying element facilitates the formation of the 4M-Ring by occupying its central position and linking four edge-sharing FK polyhedra. Furthermore, evidence from electron microscopy and small-angle neutron scattering suggests that 4M-Rings organize into a nanoscale network with diffuse interfaces, reducing interfacial energy and enhancing exceptional thermal stability. Our findings suggest the possibility of the presence of novel Frank-Kasper medium-range order in metallic glasses with minor additions and reveal new structural principles that govern amorphous materials.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121897"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145897435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strengthening and deformation mechanisms in CoCrFeMnNi-based medium- and high-entropy alloys at room and cryogenic temperatures","authors":"David D.S. Silva ,&nbsp;Francisco G. Coury ,&nbsp;Levente Vitos ,&nbsp;Wei Li ,&nbsp;Shuo Huang ,&nbsp;Norbert Schell ,&nbsp;Paul Mason ,&nbsp;Amy J. Clarke ,&nbsp;Michael J. Kaufman ,&nbsp;Claudemiro Bolfarini","doi":"10.1016/j.actamat.2025.121879","DOIUrl":"10.1016/j.actamat.2025.121879","url":null,"abstract":"<div><div>In this study, novel non-equiatomic CoCrFeMnNi-based medium- and high-entropy alloys (M/HEAs) were designed to activate distinct deformation mechanisms, including twinning-induced plasticity (TWIP) and/or transformation-induced plasticity (TRIP). Tensile tests were performed at 298 and 173 K. A variety of <em>ex-situ</em> multiscale characterization techniques, strengthening modeling, thermodynamic modeling (CALPHAD method), and <em>ab initio</em> density functional theory (DFT) calculations were employed to investigate the structural and microstructural evolution, enabling accurate identification of the strengthening and active deformation mechanisms operating in the M/HEAs. Strengthening modeling revealed that grain boundary strengthening was the primary contributor to yield strength at both temperatures. A key finding of this study is that a controlled FCC<span><math><mo>→</mo></math></span>HCP martensitic transformation, associated with TRIP, enhances the strength-ductility balance even when the resulting HCP phase reaches ∼50% volume fraction. This demonstrates that TRIP-enabled metastability engineering is a promising strategy for designing high-performance M/HEAs for next-generation structural applications in energy, aerospace, and defense.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121879"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of twinning configurations on the mechanical performance of small-scale FCC metallic materials","authors":"Jinqiao Liu ,&nbsp;Ranming Niu ,&nbsp;Ji Gu ,&nbsp;Ying Liu ,&nbsp;Song Ni ,&nbsp;Julie Cairney ,&nbsp;Min Song ,&nbsp;Yiu-Wing Mai ,&nbsp;Ting Zhu ,&nbsp;Xiaozhou Liao","doi":"10.1016/j.actamat.2025.121880","DOIUrl":"10.1016/j.actamat.2025.121880","url":null,"abstract":"<div><div>The increasing demand for high-performance miniaturised devices has sparked extensive interest in enhancing the mechanical properties of micro- and nano-sized materials. Deformation twinning, a fundamental mechanism known for enabling strength–ductility synergy in bulk materials, has emerged as a potential strengthening strategy for small-scale systems. However, the relationship between twinning behaviour and the mechanical performance of small-sized materials remains poorly understood. This study employs quantitative in-situ tensile straining transmission electron microscopy combined with comprehensive microstructural characterisation to investigate the effects of three critical aspects of twinning behaviour on mechanical performance in small-sized face-centred cubic metallic materials: twin density, twin–twin interactions, and modes of twin boundary motion. The findings reveal that: (1) increasing twin density improves ductility of small-sized samples, but this effect hinges on the absence of stress-concentration sites; (2) twin–twin interactions, caused by their intersecting behaviour, induce stress concentration and promote necking, resulting in a distinct fracture mechanism compared to single-system twinning; and (3) twin-boundary sliding, in contrast to twin-boundary migration, leads to highly localised deformation, pronounced softening, and significantly reduced ductility. These results provide important insights into the structural design of small-sized single-crystalline materials where twinning-induced plasticity is a dominant deformation mechanism.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121880"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145923064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D perspective on cavity-guided dendritic array evolution in single-crystal superalloys: A novel vectorized analytical model","authors":"Haoyu Zhou ,&nbsp;Congjiang Zhang ,&nbsp;Chuanxin Shi ,&nbsp;Hongbin Yu ,&nbsp;Hongda Kang ,&nbsp;Yufeng Yang ,&nbsp;Weili Ren ,&nbsp;Biao Ding ,&nbsp;Tianxiang Zheng ,&nbsp;Yunbo Zhong ,&nbsp;Ang Zhang ,&nbsp;Peter K. Liaw","doi":"10.1016/j.actamat.2026.121921","DOIUrl":"10.1016/j.actamat.2026.121921","url":null,"abstract":"<div><div>A fundamental mechanism of the dendritic array evolution during the directional solidification (DS) of modern turbine blades remains inadequately understood. This is largely due to the geometric constraints imposed by the complex shell mold, which defines both the external airfoil and internal cooling passages. This work focuses on establishing a model that integrates spiral geometry parameters, temperature gradients, and crystallographic orientations by developing a vectorized analytical framework in 3D Cartesian coordinates. It could quantitatively describe anisotropic dendritic growth kinetics. The results show that temperature gradients along the direction of secondary branches govern the dendrite transformation, leading to the formation of linear dendritic arrays in transverse cross-sections. During the spiral rise, the linear dendritic arrays undergo dynamic directional changes, and newly formed dendrites replace original ones through orientation competition and spatial dominance. The rearrangement of dendritic arrays is orthogonal to the original arrangement. This study clarifies the evolution behavior of dendritic arrays in complex cavities and provides a theoretical foundation for controlling solidification microstructures in single-crystal (SC) blades.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121921"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145947510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of strain rate and c-axis orientation on microscale α-Ti compression: From kink bands to twinning","authors":"Kamila Hamulka ,&nbsp;Tijmen Vermeij ,&nbsp;Amit Sharma ,&nbsp;Renato Pero ,&nbsp;Johann Michler ,&nbsp;Xavier Maeder","doi":"10.1016/j.actamat.2026.121923","DOIUrl":"10.1016/j.actamat.2026.121923","url":null,"abstract":"<div><div>The plastic deformation behavior of high-purity alpha-titanium (α-Ti) single crystals is investigated through micropillar compression experiments over a wide range of strain rates <span><math><mrow><mo>(</mo><mrow><msup><mrow><mn>10</mn></mrow><mrow><mo>−</mo><mn>3</mn><mspace></mspace></mrow></msup><mtext>to</mtext><mspace></mspace><msup><mrow><mn>10</mn></mrow><mn>3</mn></msup><mspace></mspace><msup><mrow><mi>s</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow><mo>)</mo></mrow></math></span> at room temperature. For <em>c</em> - axis compression, where prismatic slip is geometrically unfavorable, two distinct deformation regimes emerge. At low to intermediate strain rates <span><math><mrow><mo>(</mo><mover><mrow><mi>ε</mi></mrow><mi>˙</mi></mover><mo>&lt;</mo><msup><mrow><mn>10</mn></mrow><mn>2</mn></msup><mspace></mspace><msup><mrow><mi>s</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup><mo>)</mo></mrow></math></span> plasticity is governed by a non-classical kink band-type mechanism. Deformation is accommodated within broad, localized bands exhibiting significant continuous lattice rotation and internal <span><math><mrow><mo>〈</mo><mrow><mi>c</mi><mo>+</mo><mi>a</mi></mrow><mo>〉</mo><mspace></mspace></mrow></math></span> dislocation structures. These bands lack discrete slip traces and show features distinct from conventional slip or twinning. At higher strain rates <span><math><mrow><mo>(</mo><mrow><mover><mrow><mi>ε</mi></mrow><mi>˙</mi></mover><mo>≥</mo><msup><mrow><mn>10</mn></mrow><mn>2</mn></msup><mspace></mspace><msup><mrow><mi>s</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></mrow><mo>)</mo></mrow></math></span> a transition to deformation twinning is observed, characterized by exhaustive <span><math><mrow><mrow><mo>{</mo><mrow><mn>11</mn><mover><mn>2</mn><mo>¯</mo></mover><mn>2</mn></mrow><mo>}</mo></mrow><mrow><mo>〈</mo><mrow><mover><mn>1</mn><mo>¯</mo></mover><mover><mn>1</mn><mo>¯</mo></mover><mn>23</mn></mrow><mo>〉</mo></mrow></mrow></math></span> twinning and twin-twin interactions. This shift in deformation mode coincides with a notable increase in flow stress. In contrast, for compression perpendicular to the <em>c</em> - axis, plastic deformation is consistently accommodated by prismatic <span><math><mrow><mrow><mo>{</mo><mrow><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>0</mn></mrow><mo>}</mo></mrow><mrow><mo>〈</mo><mrow><mn>11</mn><mover><mn>2</mn><mo>¯</mo></mover><mn>0</mn></mrow><mo>〉</mo></mrow></mrow></math></span> slip across the entire range of strain rates, without showing any evidence of twinning or kink band formation. Additionally, the flow stress is significantly (7x) lower than that under <em>c</em> - axis loading. This work provides direct experimental evidence of strain rate-induced transitions in deformation mechanisms of α-Ti at the microscale.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121923"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrigendum to “Nested crystal graph neural networks for modeling chemically complex materials” [Acta Materialia 303 (2026) 121725]","authors":"Yiding Wang ,&nbsp;Fengpei Zhang ,&nbsp;Tianqing Li ,&nbsp;Xiangdong Ding ,&nbsp;Graeme J. Ackland ,&nbsp;Hongxiang Zong ,&nbsp;Turab Lookman ,&nbsp;Jun Sun","doi":"10.1016/j.actamat.2025.121864","DOIUrl":"10.1016/j.actamat.2025.121864","url":null,"abstract":"","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121864"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145956728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-block element modulation enables high temperature superconductivity in quaternary hydrides at low pressures","authors":"Pengye Liu ,&nbsp;Mingyang Du ,&nbsp;Tian Cui ,&nbsp;Zhao Liu","doi":"10.1016/j.actamat.2026.121953","DOIUrl":"10.1016/j.actamat.2026.121953","url":null,"abstract":"<div><div>Hydrides synthesis guided by structural design has significantly advanced the exploration for high-temperature superconductors but most hydrides still require extremely high pressures, which hinders their practical applications. Here, we propose a design strategy based on alloyed A15 frameworks, guided by chemical bonding principles and the strategic tuning of elements from different blocks of the periodic table, through which a series of superconducting quaternary XYZ₂H₁₂ hydrides were constructed. First-principles calculations identified six thermodynamically stable hydrides out of 80 candidates at 20 GPa, with GaAlZr₂H₁₂ and GaAlHf₂H₁₂ exhibiting <em>T</em>_c of 74 K and 69 K, respectively. Notably, the <em>T</em>_c of GaAlZr₂H₁₂ increases to 79 K at 15 GPa, exceeding the temperature of liquid nitrogen. Importantly, we reveal that the incorporation of <em>p</em>- and <em>d</em>-block elements enhances the density of states at the Fermi level and induces phonon softening via Fermi surface nesting, thereby significantly enhancing electron-phonon coupling strength. And strong electron-phonon matrix elements, primarily driven by hydrogen vibrations, significantly contribute to boost superconductivity in GaAlZr₂H₁₂ and GaAlHf₂H₁₂. Our study demonstrates that the bonding-guided approach combined with multiblock elemental tuning strategy offers an effective route for designing stable hydride superconductors, while providing guidance for realizing high-<em>T</em>_c superconductor under experimentally accessible low pressures.</div></div>","PeriodicalId":238,"journal":{"name":"Acta Materialia","volume":"306 ","pages":"Article 121953"},"PeriodicalIF":9.3,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146014363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}