Heterogeneous nucleation effect of in situ iron-rich nanoparticles on grain refinement of copper alloy

2016 ◽  
Vol 168 ◽  
pp. 188-191 ◽  
Author(s):  
Kaixuan Chen ◽  
Xiaohua Chen ◽  
Ding Ding ◽  
Guodong Shi ◽  
Zidong Wang
Keyword(s):  
Grain Refinement ◽  
Heterogeneous Nucleation ◽  
Copper Alloy ◽  
Nucleation Effect

scholarly journals Roles of Lanthanum and Cerium in Grain Refinement of Steels during Solidification

Metals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 884 ◽  
Author(s):  
Yunping Ji ◽  
Ming-Xing Zhang ◽  
Huiping Ren
Keyword(s):  
Mechanical Properties ◽  
Grain Refinement ◽  
Rare Earths ◽  
Heterogeneous Nucleation ◽  
The Past ◽  
Cast Steels ◽  
Steel Castings ◽  
Similarity And Difference

Refinement of as-cast structures is one of the most effective approaches to improve mechanical properties, formability, and surface quality of steel castings and ingots. In the past few decades, addition of rare earths (REs), lanthanum and cerium in particular, has been considered as a practical and effective method to refine the as-cast steels. However, previous reports contained inconsistent, sometime even contradictory, results. This review summaries the major published results on investigation of the roles of lanthanum or/and cerium in various steels, provides reviews on the similarity and difference of previous studies, and clarifies the inconsistent results. The proposed mechanisms of grain refinement by the addition of lanthanum or/and cerium are also reviewed. It is concluded that the grain refinement of steels by RE additions is attributed to either heterogeneous nucleation on the in-situ formed RE inclusions, a solute effect, or the combined effect of both. The models/theories for evaluation of heterogeneous nucleation potency and for solute effect on grain refinement of cast metals are also briefly summarized.

Microstructure and Properties of ZcuSn3Zn8Pb6NiFeCo Alloy

2012 ◽  
Vol 430-432 ◽  
pp. 609-618 ◽  
Author(s):  
Qiang Song Wang ◽  
Zuo Fei Song ◽  
Zai Qiang Feng ◽  
Zi Dong Wang
Keyword(s):  
Grain Refinement ◽  
Copper Alloy ◽  
Iron Nanoparticles ◽  
Outstanding Contribution ◽  
High Undercooling ◽  
Alloy Solidification ◽  
Microstructure And Properties ◽  
New Class

In Situiron nanoparticles can be formed during copper alloy solidification. Here we consider ZCuSn3Zn8Pb6Ni1FeCo alloy.It is noted that high undercooling is the motive power of nanoparticles during solidification , which would act as heterogeneous nuclei to achieve outstanding contribution for grain refinement compared to ZCuSn3Zn8Pb6Ni1 alloy. Convection of the melt inhibit the growth of nanoparticles by way of prohibitting the deposition of iron atoms on the surface.This technique offer new enlightenment for the control of in-situ nanoparticles formed during alloy solidification,and also opens the door to a new class of dispersed nanoparticles strengthened materials.

Heterogeneous Nucleation for AZ91 with In Situ Synthesis Al4C3

2010 ◽  
Vol 97-101 ◽  
pp. 1069-1072
Author(s):  
Xue Quan Luo ◽  
Hong Min Guo ◽  
Xiang Jie Yang
Keyword(s):  
Grain Refinement ◽  
Magnesium Alloys ◽  
Master Alloy ◽  
Heterogeneous Nucleation ◽  
Critical Factor ◽  
In Situ Synthesis ◽  
Experimental Results ◽  
Al Alloy

Heterogeneous nucleation is a critical factor for grain refinement magnesium alloys. The paper reports the Al-9wt.%Mg-10wt.%SiCp master alloy were prepared by adding SiCp into the Al-Mg molten with stirring in 610-595°C, which were introduced into AZ91. Experimental results indicated Al4C3 were in situ synthesis on the surface of SiCp by the reaction between SiCp and Al in 850°C, which could be as nucleant substrate for primary Mg during the solildification of magnesium alloys. This investigation provided a novel idea for grain refinement Mg-Al alloy.

Mechanism for In Situ Iron Nanoparticles Formed during Copper Alloy Solidification

2011 ◽  
Vol 189-193 ◽  
pp. 2441-2447
Author(s):  
Qiang Song Wang ◽  
Zhuo Fei Song ◽  
Zai Qiang Feng ◽  
Zi Dong Wang
Keyword(s):  
Grain Refinement ◽  
Copper Alloy ◽  
Iron Nanoparticles ◽  
Outstanding Contribution ◽  
High Undercooling ◽  
Feco Alloy ◽  
Alloy Solidification ◽  
New Class

In-situ iron nanoparticles can be formed during copper alloy solidification. Here we consider ZCuSn3Zn8Pb6Ni1FeCo alloy and demonstrate that high undercooling is the motive power of nanoparticles during solidification , which would act as heterogeneous nuclei to achieve outstanding contribution for grain refinement compared to ZCuSn3Zn8Pb6Ni1 alloy. Convection of the melt inhibit the growth of nanoparticles by way of prohibitting the deposition of iron atoms on the surface.This technique offer new enlightenment for the control of in-situ nanoparticles formed during alloy solidification,and also opens the door to a new class of dispersed nanoparticles strengthened materials.

An Investigation on Grain Refinement Mechanism of Master Alloys Al-Ti, Al-TiC and Al-Ti-C Toward Pure Aluminum

2013 ◽  
Vol 652-654 ◽  
pp. 1072-1075 ◽  
Author(s):  
Wan Wu Ding ◽  
Jiang Tao Zhu ◽  
Wen Jun Zhao ◽  
Tian Dong Xia
Keyword(s):  
Grain Refinement ◽  
Heterogeneous Nucleation ◽  
Pure Aluminum ◽  
Grain Refining ◽  
Nucleation Effect ◽  
Commercially Pure ◽  
Master Alloys ◽  
Refinement Mechanism ◽  
Heat Preservation

The grain refining effects of Al-Ti, Al-TiC and Al-Ti-C master alloys on commercially pure aluminum were compared, and the grain refinement mechanism of TiAl3 and TiC among master alloys was discussed. The results show that: the grain refinement of the master alloys Al-TiC and Al-Ti toward pure aluminum mainly stems from the heterogeneous nucleation role of TiC and TiAl3 particles, but with the extension of heat preservation time of fused mass, its role of heterogeneous nucleation will decline due to dissolution of TiAl3 and aggregation and precipitation of TiC. The preferable grain refinement effects of Al-Ti-C master alloys toward pure aluminum are mainly due to the fact that when TiAl3 and TiC particles are acted commonly as heterogeneous nucleation particles, the heterogeneous nucleation effect of TiC particles will be enhanced because of the presence of TiAl3.

Heterogeneous nucleation effect of in situ nanoparticles on the metal–matrix microstructure

2014 ◽  
Vol 137 ◽  
pp. 455-459 ◽  
Author(s):  
Hao Tang ◽  
Xiaohua Chen ◽  
Xiang Luo ◽  
Mingwen Chen ◽  
Zidong Wang ◽  
...  
Keyword(s):  
Heterogeneous Nucleation ◽  
Metal Matrix ◽  
Matrix Microstructure ◽  
Nucleation Effect

Enhanced Grain Refinement of W18Cr4V High‐Speed Steel using in situ TiN‐Nb‐Cr@Graphene/Fe Nanocomposite Inoculant

2021 ◽  
Author(s):  
Lina Bai ◽  
Chunxiang Cui ◽  
Jianjun Zhang ◽  
Lichen Zhao ◽  
Guixing Zheng ◽  
...  
Keyword(s):  
Grain Refinement ◽  
High Speed ◽  
High Speed Steel

Microstructure and Tensile Property of Zn-Al Alloy Reinforced with Titanium Produced by Electrolysis

2009 ◽  
Vol 79-82 ◽  
pp. 1415-1418 ◽  
Author(s):  
Shu Qing Yan ◽  
Jing Pei Xie ◽  
Wen Yan Wang ◽  
Ji Wen Li
Keyword(s):  
Grain Size ◽  
Tensile Property ◽  
Heterogeneous Nucleation ◽  
Titanium Content ◽  
Small Dimension ◽  
Al Alloy ◽  
Exotic Particles ◽  
Titanium Aluminum ◽  
High Dispersity

In this study, some low-titanium aluminum alloys produced by electrolysis were prepared and the effect of various titanium contents on microstructure and tensile property of Zn-Al alloy was investigated. The test results showed that addition of titanium by electrolysis is an effective way to refine the grain size of Zn-Al alloy. As the titanium content is 0.04 wt%, the grain size becomes to be a minimum value and the tensile property of the alloy reaches to the maximum. Electrolysis showed that titanium atoms are to be some inherent particles in low-titanium aluminum alloy. These titanium atoms enter into the aluminum melt liquid and spread to the whole melt rapidly under stirring action of electromagnetic field of the electric current. The heterogeneous phase nuclei are high melting TiC and TiAl3 particles formed from in-situ precipitating trace C and Ti during cooling process. These in-situ precipitating heterogeneous nucleation sites with small dimension, high dispersity, cleaning interface and fine soakage with melt, have better capacity of heterogeneous nucleation than of exotic particles. It may inhibit grain growth faster and more effective in pinning dislocations, grain boundaries or sub-boundaries.

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