High‐Throughput Evaluation of Hardening Coefficients of Eight Alloying Elements in Magnesium
High‐Throughput Evaluation of Hardening Coefficients of Eight Alloying Elements in Magnesium
复制标题
镁中八种合金元素硬化系数的高通量评估
DOI：
10.1002/adem.202300847
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发表时间：
2023
影响因子：
3.6
通讯作者：
Zhao, Ji-Cheng
中科院分区：
文献类型：
--
作者：
Wang, Chuangye;Zhong, Wei;Garnett, Jess;Zhao, Ji-Cheng
采用液固扩散偶（LSDCs）在单相六方封闭填充（hcp）固溶体中产生组分梯度，其组分可达到各种溶质在Mg中的溶解度极限。在LSDCs中，纳米压痕扫描可以有效地评估hcp Mg相中八种合金元素（Al, Ca, Ce, Gd, Li, Sn， Y和Zn）的成分相关硬度。硬化系数是固溶体硬化效能的一个指标，根据测量的成分硬度数据进行评估，并与各种材料特性（如原子半径、剪切模量和溶质的弹性模量）相关。纳米压痕法测定的Al、Gd、Sn、Y和Zn的硬化力等级与文献报道的微压痕法测定的结果一致。在Mg基hcp二元固溶体中的硬化系数（效价）由强到弱依次为Ce > Ca > Y≈Gd > Zn > Al≈Sn > Li。硬化系数与强化强度密切相关。
Liquid–solid diffusion couples (LSDCs) are employed to generate a composition gradient in the single‐phase hexagonal closed‐packed (hcp) solid solution with compositions up to the solubility limit of various solutes in Mg. Nanoindentation scanning across the composition gradient in LSDCs allows effective evaluation of composition‐dependent hardness of eight alloying elements (Al, Ca, Ce, Gd, Li, Sn, Y, and Zn) in the hcp Mg phase. The hardening coefficients, an indicator of the potency of solid‐solution hardening, are evaluated from the measured composition‐hardness data and correlated with various materials properties such as atomic radius, shear modulus, and elastic modulus of the solutes. The rank of hardening potency of Al, Gd, Sn, Y, and Zn measured by nanoindentation is in good agreement with that measured by microindentation reported in the literature. The hardening coefficient (potency) from the strongest to the weakest is Ce > Ca > Y ≈ Gd > Zn > Al ≈ Sn > Li in Mg‐based hcp binary solid solutions. The hardening coefficient is found to be closely correlated with the strengthening potency.