A kind of high-strength ultra-fine-grained magnesium-tin-bismuth-manganese alloy and its preparation method

A technology of crystalline magnesium-tin-bismuth-manganese alloy and magnesium-tin-bismuth-manganese alloy, which is applied in the field of high-strength ultra-fine-grained magnesium-tin-bismuth-manganese alloy and its preparation, can solve the problems of low absolute strength, poor low-temperature deformability, and high production cost of magnesium alloys. problem, to achieve the effect of promoting dynamic recrystallization, low cost and short process

Active Publication Date: 2022-06-17
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art and solve the technical problems of low absolute strength, poor low-temperature deformability and high prod

Method used

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  • A kind of high-strength ultra-fine-grained magnesium-tin-bismuth-manganese alloy and its preparation method
  • A kind of high-strength ultra-fine-grained magnesium-tin-bismuth-manganese alloy and its preparation method
  • A kind of high-strength ultra-fine-grained magnesium-tin-bismuth-manganese alloy and its preparation method

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Experimental program
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Example Embodiment

[0023]实施例1

[0024]一种高强度超细晶镁锡铋锰合金，其组成及其重量百分比含量为Sn：5％；Bi：5％；Mn：0.5％，其余为镁以及无法避免的杂质。Mg2Sn、Mg3Bi2弥散相分布在合金基体上，具有小于1μm的超细晶组织。

[0025]一种高强度超细晶镁锡铋锰合金的制备方法，包括以下步骤：

[0026]1)原料准备：镁块、锡颗粒、铋颗粒、镁-锰中间合金块按照重量百分比含量配料，原料的纯度均为99.99％；

[0027]在本实施例1中，按下表1中各个化学物质材料质量准备好，并用砂轮将镁块和镁-锰中间合金块打磨光亮，然后放入干燥箱里进行干燥。同时将坩埚、坩埚钳、搅拌棒的表面均匀刷涂料，涂料的配方如下表2所示。

[0028]表1化学物质材料质量、形状、纯度

[0029]化学物质材料质量(g)形状纯度(％)Mg420固体块状99.99Sn26.25固体颗粒状99.99Bi26.25固体颗粒状99.99Mg-10％Mn52.5固体块状99.99

[0030]表2涂料配方

[0031]滑石粉(g)水(ml)水玻璃(g)8025020

[0032]2)熔炼成锭：将步骤1)准备的原料加入熔炼炉中，在SF6与CO2的混合保护气气氛中熔炼，然后浇铸成圆柱型铸锭；其中，SF6与CO2的体积比为40：1；

[0033]在本实施例中，具体的熔炼过程采用以下步骤：

[0034]a、首先，将坩埚预热至300℃左右，随即把已打磨、称好质量并且干燥后的镁块放在坩埚里，并将镁块与坩埚一起放入电阻炉，向电阻炉通入SF6与CO2的混合保护气，SF6与CO2的体积比为40：1；然后，待电阻炉升温至710℃，保温25min，将已干燥的Sn、Bi颗粒放入坩埚中；最后，将电阻炉升温至720℃，保温20min，随后已干燥的镁-锰中间合金再放入坩埚中；

[0035]b、将电阻炉升温至750℃，保温20min，使得Sn、Bi、Mn三种合金元素有足够长的时间在熔融的镁合金液中得到充分扩散，使合金成分均匀化；待保温结束后，为了准备精炼处理，再将电阻炉降温至740℃，精炼时需要对合金液剧烈搅拌，同时缓慢加精炼剂(精炼剂成分如下表3所示)，整个精炼过程维持1-2min；

[0036]c、因精炼后导致电阻炉炉温降低，所以需要把电阻炉重新升温至740℃，保温20min，保温结束后等待炉温降至710℃，随后开始往已预热金属模具中开始浇铸(模...

Example Embodiment

[0048]实施例2

[0049]一种高强度超细晶镁锡铋锰合金，其组成及其重量百分比含量为Sn：5％；Bi：5％；Mn：1％，其余为镁以及无法避免的杂质。反应产物中各元素含量如图1中的XRD图谱所示，图1中纵坐标为衍射强度，横坐标为衍射角2θ，镁锡铋锰合金主要由ɑ-Mg相、Mg2Sn相、Mg3Bi2相组成。

[0050]一种高强度超细晶镁锡铋锰合金的制备方法，其步骤与实施例1相同，区别仅在于原料中元素含量不同，即镁锡铋锰合金组成及其重量百分比含量为Sn：5％；Bi：5％；Mn：1％，其余为镁以及无法避免的杂质。

[0051]如图2所示，能观察到本实施例2制得的镁锡铋锰合金中存在大量细小的动态再结晶晶粒，以及少量长条状的未动态再结晶。如图3所示，本实施例2制得的镁锡铋锰合金在细小的动态再结晶中，晶粒尺寸小于1μm的晶粒占81.17％，平均晶粒尺寸(AGS)为0.55μm。如图4所示，延伸率2.4％左右，抗拉强度为414MPa，屈服强度为390MPa。

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Abstract

A high-strength ultra-fine-grained magnesium-tin-bismuth-manganese alloy and its preparation method belong to the technical field of magnesium alloys and solve the technical problems of low absolute strength, poor low-temperature deformability and high production cost of magnesium alloys. The invention uses magnesium, tin, Bismuth and magnesium-manganese master alloys are used as raw materials, and the weight components of each composition are Sn: 3-6%; Bi: 3-6%; Mn: 0.5-1%, and the balance is magnesium and unavoidable impurities. After smelting and casting, solid solution Processing and low-temperature extrusion to prepare a high-strength ultra-fine-grained magnesium alloy. During hot extrusion, the second phase is broken into fine particles and evenly distributed in the magnesium matrix, which strengthens the matrix, promotes dynamic recrystallization, refines the structure, and enhances the mechanical properties of the magnesium alloy. At the same time, compared with the rare earth magnesium alloy and the complex and expensive large plastic deformation technical means, the present invention has the advantages of low cost, simple process, short process, etc., so that it has certain economic benefits and application potential.

Description

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Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/03C22F1/06B21C23/02
CPCC22C23/00C22C1/03C22F1/06B21C23/02
Inventor 程伟丽罗逸豪李峰陈宇航张宇琴王利飞王红霞
Owner TAIYUAN UNIV OF TECH
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