Effects of stacking sequence and short-range ordering of solute atoms on elastic properties of Mg–Zn–Y alloys with long-period stacking ordered structures

Enhanced Performance of Mg–Zn–Y–Mn Alloy via Minor Ca Addition

“…Therefore, W phase in solid‐solution treatment alloy shows much higher hardness and elastic modulus than in as‐cast alloy. The short‐range ordered clusters' structure of Zn 6 Y 8 (Mg, Zn, and Y) was the most favorable structural model in energy for the 14H‐LPSO phase . The higher elastic modulus of 14H‐LPSO phase than that of 18R‐LPSO phase was attributed to the energy of formation of short‐range ordered clusters Zn 6 Y 8 (Mg, Zn, and Y) and the stacking sequence in the 14H‐LPSO phase and their influence on the elastic modulus related to the atomic bonding between the stacking layers .…”

“…Ca element with abundant reserves can efficiently refine grain and randomize texture of the Mg alloys . Reportedly, the addition of minor Ca could significantly improve plasticity of Mg alloys sheet, because the segregation behavior or altered deformation behavior of Ca elements is similar to some rare earth elements . Up to date, to our best knowledge, few studies focused on the influences of Ca elements on the precipitation behavior (both LPSO phase and W phase) and hot deformation behavior in Mg–Zn–Y–Mn alloys containing LPSO and W phase.…”

Extraction of Single-crystalline Elastic Constants from Polycrystalline Samples with Crystallographic Texture

“…. は じ め に 弾性特性は，構造材料，機能材料および生体材料において 最も基本的な力学特性である (1) (2) ．特に，単結晶の弾性特性 は，材料設計だけではなく，有限要素法等を用いたモデル計 算 (3) や Phase field 法を用いた組織形成シミュレーション 等 (4) の計算機シミュレーションおよびモデリングにおいても 必要とされる物性値である．さらに，単結晶の弾性特性は X 線および中性子回折を用いて実施される，応力負荷時の 格子ひずみ測定を用いた塑性変形の解析においても用いられ ている (5) iVRH)近似 (10) および inverse Self consistent(iSC)近似 (11) と名付けられている．これまでに，これらの手法を用いて， 単結晶育成が困難なため単結晶弾性率が決定されていなかっ た Mg Zn Y 合金の長周期積層型規則(LPSO)相 (10) (12)…”

“…iSC 近似と文献値(27) の弾性スティフネスの差の rms 値および iVRH 近似と文献値の差の rms 値．(Reprinted from Ref.11 with permission from Elsevier.) Reuss  Hill 近 似 お よ び inverse Self  consistent 近似の詳細と単結晶弾性率の決定精度について紹介し た．これらの方法は，実際に単結晶の育成が困難な Mg Zn Y 合金の LPSO 相(10)(12) ，純 Ti の v 相 (13) およ び AZ31Mg 合金(11) に適用され，単結晶の弾性特性を明らかにしてきた． Mg  Zn  Y 合 金 の LPSO 相 に お い て は ， inverse Voigt …”

Anisotropic Plastic Behavior in an Extruded Long-Period Ordered Structure Mg90Y6.5Ni3.5 (at.%) Alloy

“…The LPSO phase with 18R or 14H structure shows a strong elastic and plastic anisotropy. In the elastic regime, the LPSO phase exhibits a higher Young's modulus and shear modulus compared to Mg [19][20][21][22] and depending on the LPSO crystal orientation. On the other hand, its plastic behavior is controlled by the activation of the basal slip system with a CRSS of around 10 MPa [23,24].…”