191 research outputs found
Study on martensitic transformation twinning in ductile metastable body-centered-cubic high entropy alloys
No full textMartensitic transformation twinning including {111}α’’ type I, ‘‘{351}’’< 2‾11 >α’’ type II and {021}α’’ twins, and extrinsic {111}α’’ stacking faults were investigated in a deformed body-centered-cubic (BCC) high entropy alloy (HEA). The interaction between martensitic twinning and local chemical environment variation made great contributions to strain accommodation upon straining, implying a novel route to develop ductile BCC HEAs
Basal slip mediated tension twin variant selection in magnesium WE43 alloy
No full textTension twinning nucleation and evolution in Mg WE43 alloy over a large sampling area was investigated using a quasi-in-situ EBSD/SEM method during interrupted compression testing. The results showed tension twins with both high and low macroscopic Schmid factor (MSF) were activated under a compressive stress of 100 MPa with a strain rate of 10−1 s−1. Basal slip in most grains dominated at this stress, so nucleation of twin variants required little interaction with non-basal slip, which was different from other studies that reported prismatic slip and/or tension twinning were required to activate some low MSF tension twin variants. The geometric compatibility factor (m') was demonstrated to be an important factor to determine tension twin variant selection assisted by basal slip. The analysis indicated m' played a critical role over MSF in tension twin variant selection during twin nucleation stage, and final twin variant types were insensitive to increasing stress, but they inherited twin variant types determined at twin nucleation stage. Moreover, which specific grain boundary of a grain with hard orientation for basal slip would nucleate which twin variant could be also validated by m' and largely depended on two factors: (a) high value of m' with 1st or 2nd rank between the tension twinning of nucleated twin variant and basal slip in adjoining grains; and (b) intensive basal slip activity in the neighbouring grains before twin nucleation
Application of a New Asphalt Pavement Maintenance Agent on Yuhe Road of Chongqing
No full textIn this paper, the abilities of recovery and regeneration for aged asphalt of a new type of asphalt pavement maintenance agent are studied. The agent is applied in the construction of test section of Yuhe Road, and the pavement performances before and after the construction are compared. The test indicates that after the maintenance agent is added into aged asphalt, the penetration and ductility are effectively improved, the softening point is lowered. When the penetration depth of agent reaches 6 mm，the texture depth , friction coefficient and antiskid value are improved to some extent ,the water permeability coefficient is reduced, and the appearance of pavement is improved as well，The paper provided reference for the applying curing agent of asphalt pavement to the preventive maintenance system.</jats:p
Influence of tantalum composition on mechanical behavior and deformation mechanisms of TiZrHfTa<sub>x</sub> high entropy alloys
No full textThe effects of metastability engineering on tuning deformation behavior and deformation mechanisms in TiZrHfTa
X (x = 1.00, 0.80, 0.60, 0.50) refractory body-centered cubic (BCC) high entropy alloys were investigated, with specific emphasis on elucidating the underlying interplay between phase stability, mechanical property, and deformation twins. It was found that in proper thermomechanical treated samples, a variation of tantalum content can effectively tune the activation of various deformation mechanisms. Detailed electron back-scattered diffraction and transmission electron microscopy analyses revealed for the first time that {332}<113̅>
BCC twinning, deformation-induced α’’ phase, {111}
α’’ type I and <2̅11>
α’’ type II twinning can be sequentially activated in TiZrHfTa
X (x = 1.00, 0.80, 0.60, 0.50) high entropy alloys with decreasing the content of tantalum. The comprehensive strengthening effect of transformation induced plasticity and twinning induced plasticity, was discussed and attributed as the pivotal factor for the improved work hardening capability and mechanical performances, especially for alloys with lower tantalum contents. Consequently, we extended the conventional bond order and d‐orbital energy level diagram that was originally developed for body-centered cubic titanium alloys for deformation mechanism evaluation to body-centered cubic high entropy alloys on the basis of current results, which sheds light on the design of ductile body-centered cubic high entropy alloys with expected deformation mechanisms and optimized mechanical performance.
</p
Segregation mediated heterogeneous structure in a metastable β titanium alloy with a superior combination of strength and ductility
Full text linkIn β titanium alloys, the β stabilizers segregate easily and considerable effort has been devoted to alleviate/eliminate the segregation. In this work, instead of addressing the segregation problems, the segregation was utilized to develop a novel microstructure consisting of a nanometre-grained duplex (α+β) structure and micrometre scale β phase with superior mechanical properties. An as-cast Ti-9Mo-6W alloy exhibited segregation of Mo and W at the tens of micrometre scale. This was subjected to cold rolling and flash annealing at 820 oC for 2 and 5 mins. The solidification segregation of Mo and W leads to a locally different microstructure after cold rolling (i.e., nanostructured β phase in the regions rich in Mo and W and plate-like martensite and β phase in regions relatively poor in Mo and W), which play a decisive role in the formation of the heterogeneous microstructure. Tensile tests showed that this alloy exhibited a superior combination of high yield strength (692 MPa), high tensile strength (1115 MPa), high work hardening rate and large uniform elongation (33.5%). More importantly, the new technique proposed in this work could be potentially applicable to other alloy systems with segregation problems
Deformation mechanisms in a metastable beta titanium twinning induced plasticity alloy with high yield strength and high strain hardening rate
Full text linkMetastable β titanium alloys with both twinning (TWIP) and martensite transformation (TRIP)
usually exhibit a low yield strength of between 200 and 500MPa, but high strain hardening rate
and large uniform elongation. Alloys that exhibit twinning on a single system provide a higher
yield strength, but a lower strain hardening rate. Here, for the first time, we report a new alloy
(Ti-7Mo-3Cr wt%) with both high yield strength (695 MPa) and high work hardening rate
(~1900 MPa) and a substantial 33.3% uniform elongation. The deformation mechanisms were
systematically investigated using EBSD and TEM for samples strained to 1.3%, 5% and 16%.
The high yield strength was achieved through initial deformation mechanisms of two twin
systems, namely both {332} and {112} twinning. Importantly, the martensite
transformation was suppressed at this stage of deformation. The combination of two twin
systems, with approximately the same intensity, resulted in a high strain hardening rate
(1600MPa to 1900MPa), much greater compared to alloys that exhibit a single twin system.
Moreover, the TRIP effect was observed at strains greater than 5%, which also contributed to
the high strain hardening rate large uniform elongation
Stone Crossing
No full textStone Crossing (2025)is a performance and multimedia installation by artists Lanyun Huang (Finch) and Owen G. Parry in 'The Sensitive Entity: Poetics of the Everyday' exhibition at Yuheng Art Museum, Guangzhou, China, 11 Dec 2025 - 8 March 2026.
Stone Crossing brings together Owen’s performance hangout – slow choreography, fan-made music and idle play with Finch’s playful and poetic approach to vibrant objects. It features 'Homework' (2025) – a sculpture and theatrical prop that stands in as a meteorite from outer space, a philosophers stone found in ancient Chinese tradition, or simply a rock around which a picnic happens.
The work forms a large-scale installation of domestic objects and found artworks organised intuitively into an archive of colour. The objects are picked up and activated during the live performance; reassembled or repurposed to produce choreographic actions, or "shipped" with other objects and the performers themselves to create small inconsequential shrines and monuments of the everyday. Stone Crossing meddles with time and materiality, drawing attention to the magic theatres of the everyday, while inviting readjusted and relaxed forms of spectatorship.
The Sensitive Entity exhibition invites an aesthetic and perceptual reconsideration of daily experience. In a time shaped by acceleration, the faint glimmer of light, the brief pause, the unnoticed material trace are easily eclipsed. The exhibition seeks to reawaken a delicate attentiveness, guiding viewers from“browsing” to “dwelling”, so that the density and depth of ordinary life may once again be felt.
The exhibition includes artists Guo Tutu, Emma Mo, Owen G. Parry & Lanyun Huang (Finch), Wang Yuhe, Xu Dengqian, and Zhu Guanha.
Hosted by Wang Shaoqiang, Professor at the Chinese National Academy of Arts and Director of Guangdong Museum of Art, curated by Yao Xiaofei with assistants Yu Ziqi and Li Yingzi, and presented in collaboration with local arts institutions and partners
- …
