本文選題：Ni-Mn-Ga合金 + 納米孿晶��； 參考：《材料熱處理學(xué)報(bào)》2017年07期

【摘要】：通過(guò)透射電鏡觀察了Ni_(54)Mn_(25)Ga_(21)磁性形狀記憶合金中A-D馬氏體變體對(duì)的晶體學(xué)特征。結(jié)果表明:微米級(jí)的單個(gè)馬氏體變體由納米級(jí)的粗、細(xì)兩種片層組成,這兩種片層呈(1 1 2)復(fù)合型孿晶關(guān)系。變體對(duì)之間任意兩片層的取向關(guān)系隨著細(xì)片層所占變體的體積分?jǐn)?shù)變化而改變,粗-粗(或細(xì)-細(xì))片層對(duì)的取向關(guān)系接近于相同,粗-細(xì)片層對(duì)的取向關(guān)系接近于(1 1 2)孿晶關(guān)系。此外,沿著片層的11 0方向觀察,變體間界面位于豎立位置,界面彎曲。界面處片層之間存在一定交叉,交叉的區(qū)域在10 nm以內(nèi)。
[Abstract]:The crystallographic characteristics of A-D martensite variant pairs in Nix _ (54) Mn-M _ (2) M _ (21) magnetic shape memory alloy have been observed by transmission electron microscopy (TEM).The results show that a single martensite variant of micron size is composed of two kinds of nanoscale thick and fine lamellae, and the two lamellae have a complex twin relation.The orientation relationship of any two lamellar pairs between variant pairs changes with the volume fraction of the variation of the thin layer, and the orientation relationship of the coarse-coarse (or fine-thin) lamellar pair is close to the same.The orientation relationship of coarse-thin lamellar pairs is close to that of the twin.In addition, observed along the 110 direction of the lamellar layer, the interface between the variants is in the vertical position and the interface is curved.There is a certain cross between the layers at the interface, and the cross region is less than 10 nm.
【作者單位】： 西北工業(yè)大學(xué)材料學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(51071125,51271147,51201134,51201135)
【分類號(hào)】：TG139.6

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