54Mn28+xGa18-x（x=0，4，7，9，13）γ相的微觀結(jié)構(gòu)及合金的熱力學(xué)性能。隨著Mn含量的增加，γ相開始出現(xiàn)，晶粒內(nèi)存在“微米片層包含納米片層”微觀結(jié)構(gòu)。微米片層由兩變體組成，變體包含一對(duì)呈｛011｝孿晶關(guān)系的納米片層，該片層是面心四方結(jié)構(gòu)。隨著Mn含量的增加，壓縮應(yīng)力從914 MPa增加到2175 MPa，壓縮應(yīng)變從14%增加到26%，但其形狀記憶效應(yīng)逐漸降低，馬氏體相變溫度從352 ℃提高至585 ℃。富Mn Ni-Mn-Ga合金層片γ相的引入對(duì)合金韌性增強(qiáng)雖不如富Ni合金，但合金馬氏體相變溫度更高。;Brittleness of traditional Ni-Mn-Ga alloy is a marjor obstacle for its practical applications, as actuators and sensors. The Ni-rich Ni-Mn-Ga alloy can significantly improve the ductility. However, the shape memory strain is significantly reduced. Higher martensitic transformation temperature, good thermal stability and moderate shape memory property are shown in Mn-rich Ni-Mn-Ga. In the present work, microstructural feature, mechanical properties and thermal property of Ni54Mn28+xGa18-x(x=0, 4, 7, 9, 13) were investigated. As the Mn content increases, the γ phase appears, with is a face centered tetragonal (fct) structure, and a γ grain contains a hierarchical nano-lamellae forming within micro-lamellae microstructure. A micro-lamella consists of two variants, each variant has a pair of nano-lamellae, and they are {011} twin related. Owing to the introduction of lamellar γ, the ductility is improved. With the increase in Mn content, the compressive stress increases from 914 MPa to 2175 MPa, and the compressive strain increases from 14% to 26%. The martensitic transformation temperature of such series of alloys increases from 352 ℃ to 585 ℃. For Mn-rich Ni-Mn-Ga alloy, the ductility improvement is inferior to that of Ni-rich alloy, but the martensitic transformation temperature is higher."/>