EngRN: Metals & Alloys (Topic)最新文献

A Data-Driven Bayesian Model for Predicting Fatigue Crack Nucleation in Polycrystalline Ni-Based Superalloys 多晶镍基高温合金疲劳裂纹形核预测的数据驱动贝叶斯模型

EngRN: Metals & Alloys (Topic) Pub Date : 2023-01-19 DOI: 10.2139/ssrn.3878357

M. Pinz, G. Weber, J. Stinville, T. Pollock, Somnath Ghosh

{"title":"A Data-Driven Bayesian Model for Predicting Fatigue Crack Nucleation in Polycrystalline Ni-Based Superalloys","authors":"M. Pinz, G. Weber, J. Stinville, T. Pollock, Somnath Ghosh","doi":"10.2139/ssrn.3878357","DOIUrl":"https://doi.org/10.2139/ssrn.3878357","url":null,"abstract":"This paper develops a Bayesian, probabilistic crack nucleation model in the Ni-based superalloy Ren'e 88DT for fatigue loading. A data-driven, machine learning approach is developed to identify the underlying mechanics driving crack nucleation. An experimental set of fatigue-loaded microstructures is characterized near crack nucleation sites using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) images to correlate grain morphology and crystallography to the spatial location of crack nucleation sites. A concurrent multiscale model that embeds polycrystalline microstructures, created from the EBSD images, in a self-consistent homogenized material is developed for low cycle fatigue simulations needed to create a database of state variables. The polycrystalline domain is modeled by a crystal plasticity finite element model (CPFEM), while a homogenized anisotropic plasticity model is used for the exterior domain. A Bayesian classification method is introduced to optimally select the most informative state variable predictors of crack nucleation and constructs a near-Pareto frontier of models with varying complexity. From this principal set of state variables, a simplified scalar crack nucleation indicator is formulated which encompasses all of the relevant components derived from the main discriminators. This Bayesian approach allows the micromechanical state variables responsible for causing crack nucleation events to come out naturally from existing data. The final result is a model that predicts the probability of nucleating a crack at a microstructural location, given the mechanical state of the material.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129312507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electroplasticity Mechanism Study Based on Dislocation Behavior of Al6061 in Tensile Process 基于Al6061拉伸过程位错行为的电塑性机理研究

EngRN: Metals & Alloys (Topic) Pub Date : 2022-04-01 DOI: 10.2139/ssrn.3878340

Xia’nan Li, Zhutian Xu, Linfa Peng, X. Lai

引用次数: 9

In situ Transmission Electron Microscopy Investigation of Nucleation of GP Zones Under Natural Aging in Al-Zn-Mg Alloy Al-Zn-Mg合金自然时效GP区形核的原位透射电镜研究

EngRN: Metals & Alloys (Topic) Pub Date : 2022-01-01 DOI: 10.2139/ssrn.3862295

A. Chatterjee, L. Qi, A. Misra

引用次数: 19

Isothermal Crystallization Kinetics of an Industrial-Grade Zr-Based Bulk Metallic Glass 工业级zr基大块金属玻璃的等温结晶动力学

EngRN: Metals & Alloys (Topic) Pub Date : 2021-12-01 DOI: 10.2139/ssrn.3817902

Zerong Yang, R. Al-Mukadam, M. Stolpe, M. Markl, J. Deubener, C. Körner

{"title":"Isothermal Crystallization Kinetics of an Industrial-Grade Zr-Based Bulk Metallic Glass","authors":"Zerong Yang, R. Al-Mukadam, M. Stolpe, M. Markl, J. Deubener, C. Körner","doi":"10.2139/ssrn.3817902","DOIUrl":"https://doi.org/10.2139/ssrn.3817902","url":null,"abstract":"Abstract Bulk metallic glasses (BMGs), due to their amorphous structure, exhibit remarkable mechanical properties, and there is an increasing interest in their commercialization. For the industrial fabrication of BMG, knowledge about the isothermal crystallization kinetics of industrial-grade BMG is required. Previous investigations on isothermal crystallization kinetics are mainly based on high-purity samples with very good glass forming ability and/or mainly limited to the low temperature regime. In the present study, a systematic investigation on the isothermal crystallization kinetics of an industrial-grade Zr-based BMG (Zr 59.3 Cu 28.8 Al 10.4 Nb 1.5 at.%, trade name: AMZ4) has been performed using conventional and flash differential scanning calorimetry. We report the time-temperature-transformation (TTT) diagrams of the AMZ4 with two different oxygen levels. The diagrams cover the temperature range from glass transition temperature up to liquidus temperature, that have the typical “C-shaped” noses. Faster crystallization of the higher oxygen level AMZ4 was observed, and the underlying mechanisms were investigated. The universal isothermal Johnson-Mehl-Avrami-Kolmogorov (JMAK) model was employed to model the isothermal crystallization kinetics. Satisfactory match was achieved between the experimental facts and the JMAK model, and the interfacial energies between the crystalline phase and liquid were determined as ∼ 0.04 J/ m 2 for the industrial-grade AMZ4. The crystallization fraction dependence of Avrami index and activation energy is studied and found to be neglectable in the JMAK modeling. The critical casting thicknesses were estimated based on the TTT diagrams.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130672738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Atomic-Scale Evidence of Chemical Short-Range Order in CrCoNi Medium-Entropy Alloy CrCoNi中熵合金化学短程有序的原子尺度证据

EngRN: Metals & Alloys (Topic) Pub Date : 2021-11-01 DOI: 10.2139/ssrn.3885863

LingLin Zhou, Qi Wang, Jing Wang, Xuefei Chen, P. Jiang, Hao Zhou, F. Yuan, Xiaolei Wu, Zhiying Cheng, E. Ma

{"title":"Atomic-Scale Evidence of Chemical Short-Range Order in CrCoNi Medium-Entropy Alloy","authors":"LingLin Zhou, Qi Wang, Jing Wang, Xuefei Chen, P. Jiang, Hao Zhou, F. Yuan, Xiaolei Wu, Zhiying Cheng, E. Ma","doi":"10.2139/ssrn.3885863","DOIUrl":"https://doi.org/10.2139/ssrn.3885863","url":null,"abstract":"High (or medium)-entropy alloys (H/MEAs) are complex concentrated solid solutions that may develop chemical short-range order (CSRO). In this regard, CrCoNi, the prototypical face-centered-cubic MEA, has recently kindled a debate in the H/MEA community, as it is uncertain if CSRO can possibly form in such a multi-principal-element solution, where no equilibrium or metastable intermetallic compounds have ever been seen or predicted. To answer this challenging question, here we present firm experimental evidence for the CSRO from electron diffraction as well as atomic-resolution chemical mapping, particularly under an appropriate zone axis. We also develop a methodology to reliably determine the locations of atomic columns from the line scan profiles in the chemical maps, as well as a quantitative covariance-based correlation analysis of the column chemical compositions to reveal the spatial correlations between various atomic pairs. The detailed chemical information affirms the tendency for like-pair avoidance and unlike-pair preference, specifies the preferred atomic packing and plane stacking by the three constituent species, and suggests a proposed atomic configuration that constitutes the CSRO motif. The fraction of CSRO regions is moderately lowered after either plastic deformation or high-temperature heating. A comparison is also discussed with previous endeavor identifying CSRO in H/MEAs.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126918445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 50

Phase-Field Investigation on the Peritectic Transition in Fe-C System Fe-C体系包晶转变的相场研究

EngRN: Metals & Alloys (Topic) Pub Date : 2021-10-15 DOI: 10.2139/ssrn.3777626

Y. Cai, Fei Wang, Zihan Zhang, B. Nestler

引用次数: 3

High-Entropy Structure Design in Layered Transition Metal Dichalcogenides 层状过渡金属二硫族化物的高熵结构设计

EngRN: Metals & Alloys (Topic) Pub Date : 2021-10-01 DOI: 10.2139/ssrn.3906845

Hongxiang Chen, Sheng Li, S. Huang, Lian Ma, Shengpeng Liu, Fa-Fen Tang, Yong Fang, P. Dai

{"title":"High-Entropy Structure Design in Layered Transition Metal Dichalcogenides","authors":"Hongxiang Chen, Sheng Li, S. Huang, Lian Ma, Shengpeng Liu, Fa-Fen Tang, Yong Fang, P. Dai","doi":"10.2139/ssrn.3906845","DOIUrl":"https://doi.org/10.2139/ssrn.3906845","url":null,"abstract":"Layered high-entropy compounds have been attracting a lot of attention in recent times due to their potential application in energy storage and conversion. Generally, an intra-layer scheme is widely used to realize the high-entropy structure by introducing multi-principal elements into the metal-atomic layers. Here, we propose an intercalation high-entropy scheme to realize the high-entropy structure in a series of layered transition metal dichalcogenides with a general chemical formula of MX2. Multi-principal metal elements are intercalated into the van-der-Waals gaps between MX2 slabs resulting in a series of (HEM)xMX2 compounds, in which HEM is high-entropy metals mainly composed of 3d transition metal elements such as Fe0.2Co0.2Cr0.2Ni0.2Mn0.2. Moreover, three kinds of 2D high-entropy magnetic lattices (a0 × a0, √3a0 × a0, √3a0 × √3a0) in the intercalated layers are found by tuning the intercalation content x. Significant differences in the effective moment and spin frustration among them are revealed. Furthermore, a multi-layered high-entropy structure is realized by a combination of intra-layer and intercalation schemes. The new intercalation high-entropy scheme and versatile 2D high-entropy structures reported in this work will reinforce the spirit on the exploration of new low-dimensional high-entropy systems for future applications.","PeriodicalId":438337,"journal":{"name":"EngRN: Metals & Alloys (Topic)","volume":"147 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123267566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Excavation and Analysis of a 31 MW SiMn-furnace at Eramet Kvinesdal Eramet Kvinesdal 31 MW simn炉的开挖与分析

EngRN: Metals & Alloys (Topic) Pub Date : 2021-09-12 DOI: 10.2139/ssrn.3926113

Eirik Nordbø, Sigurd Øvrelid, Eline Gridset

引用次数: 0

Effect of Alloying Elements on the Hydrogen Diffusion and Trapping in High Entropy Alloys 合金元素对高熵合金中氢扩散和俘获的影响

EngRN: Metals & Alloys (Topic) Pub Date : 2021-08-01 DOI: 10.2139/ssrn.3779736

S. C. Marques, A. V. Castilho, D. D. dos Santos

引用次数: 21

Artificial Neural Network Molecular Mechanics of Iron Grain Boundaries 铁晶界的人工神经网络分子力学

EngRN: Metals & Alloys (Topic) Pub Date : 2021-06-24 DOI: 10.2139/ssrn.3881303

Y. Shiihara, Ryosuke Kanazawa, D. Matsunaka, I. Lobzenko, T. Tsuru, M. Kohyama, H. Mori

引用次数: 10