Enhanced mechanical properties in β-Ti alloy aged from recrystallized ultrafine β grains

Proposing the Concept of Plaston and Strategy to Manage Both High Strength and Large Ductility in Advanced Structural Materials, on the Basis of Unique Mechanical Properties of Bulk Nanostructured Metals

“…Although many bulk nanostructured metals exhibit the early plastic instability as shown in the former Sect. 1.2, it has been found recently that some kinds of alloys with UFG microstructures can manage both high strength and large tensile ductility (Tsuji et al 2019;Tian et al 2014Tian et al , 2015Tian et al , 2016Tian et al , 2018bChen et al 2014;Bai et al 2018Bai et al , 2021Gao et al 2019;Chong et al 2019;Zhang et al 2020). One example was found in a Mg-6.2Zn-0.5Zr-0.2Ca (mass %) alloy (ZKX600) (Zheng et al 2017(Zheng et al , 2019.…”

“…Bulk nanostructured metals show very high strength compared to conventionally coarse-grained counterparts, but most of them still have a dilemma of the strengthductility trade-off (Tsuji et al 2002(Tsuji et al , 2008. On the other hand, it has been also found recently that bulk nanostructured metals, in particular, alloys could manage both high strength and ductility (Tsuji et al 2019;Tian et al 2014Tian et al , 2015Tian et al , 2016Tian et al , 2018bChen et al 2014;Bai et al 2018;Gao et al 2019;Chong et al 2019;Zhang et al 2020). In the current manuscript, the authors throw light on the reason why such bulk nanostructured metals can overcome the strength-ductility trade-off, and propose a strategy for managing both high strength and large ductility in advanced structural materials.…”

Realizing Structural Metallic Materials with Both High Strength and Large Ductility through Nucleation Control of Different Deformation Modes

“…ンスを示す曲線は，その形状からバナナ・カーブと呼ばれる ことも多い (2) ．TWIP(Twinning Induced Plasticity)効果 (3) などを用いて高強度と高延性を達成した第 25) ，ハイエントロピー合金 (24) (29) ，変形誘起マル テンサイト変態による TRIP(Transformation Induced Plasticity)効果 (33) ( 35) を示す Fe Ni C 合金 (19) (30) ，チタンおよび チタン合金 (17)(31) (32) などで見出されている．高 Mn 鋼超微 細粒材の場合には，粒界から多数のナノ変形双晶が発生する ことが見出された (36)(37) ．これは，マトリクスの結晶粒を微 11)(17)(18)(23)(24)(28)(29)(37) (40) ．これは，たとえ同じ転位密 度であっても，結晶粒径が小さくなると各粒内に存在する転 位の数が少なくなることに由来すると考えられる (37)…”