挤压力对晶体生长速度及枝晶间距的影响

罗继相; 潘利波; 潘欣

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挤压力对晶体生长速度及枝晶间距的影响
Effects of Extrusion Pressure on Crystal Growth Rate and Arm distance
2002年第5期页码：35-37
纸质出版日期： 2002 ，
DOI：

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[1]罗继相,,,,,,,,,,潘利波,潘欣.挤压力对晶体生长速度及枝晶间距的影响[J].特种铸造及有色合金,2002(05):35-37+1.

Luo Jixiang Pan Libo Pang Xin. Effects of Extrusion Pressure on Crystal Growth Rate and Arm distance[J]. Special Casting & Nonferrous Alloys, 2002,(5):35-37.
[1]罗继相,,,,,,,,,,潘利波,潘欣.挤压力对晶体生长速度及枝晶间距的影响[J].特种铸造及有色合金,2002(05):35-37+1. DOI：

Luo Jixiang Pan Libo Pang Xin. Effects of Extrusion Pressure on Crystal Growth Rate and Arm distance[J]. Special Casting & Nonferrous Alloys, 2002,(5):35-37. DOI：

摘要

研究了挤压铸造时挤压力对宏观晶体生长速度的影响

给出了晶体生长速度表达式。结果表明 :挤压力对合金宏观晶体生长速度的影响除与合金成分有关外

在某些挤压条件下

当形核率的增加幅度超过长大速度时

则挤压力可使宏观晶粒细化 ;反之

会使宏观晶粒变粗。随着挤压力的提高

合金凝固速度加快

一次枝晶间距和二次枝晶间距都随之减小

从而细化了树枝晶

Abstract

Effects of extrusion pressure on the growth rate of macro\|crystal in extruded casting were investigated.The mathematical expression for the growth rate of crystal was developed.It is found that besides the alloy composition

under some particular extruded conditions

the extrusion pressure resulted in refining macro\|grain when increase in nucleation rate exceeds growth rate and vice versa.The refined dendrite is responsible for the decrease in distance between both of the first dendrite and secondary dendrite during quickening alloy solidified rate with the increase of the extrusion pressure.